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Diamond Grading Information

There is no great mystery in HOW TO BUY A DIAMOND.
In the 10 minutes it takes to read the following information, you can possess as much, if not more diamond knowledge than your average diamond sales person.


CARAT
COLOR
CLARITY
CUT

Here are the factors that make up Cost

The following guide assumes the Gemological Institute of America (G.I.A.) grading system. This is the worlds most recognized system of evaluating a diamonds quality and value.  Each grade describes a different aspect of the diamond and it is only the sum total of all these characteristics which will determine if the diamond is a true gem or just a commercial grade.

CARAT


CARAT means weight (1 carat = 1/5 of a gram). The diamond weight is a very important factor to its cost.
The term "carat " originated from the seeds of the carob tree. These carob seeds are extremely uniform in eight and this made them the ideal weight unit for the ancient gem traders. This weight (one carob seed) as later standardized to be 1 carat, or 1/5th of a gram, hence a five carat diamond equals 1 gram and 155.51 carats equal one ounce.
The one carat weight is then broken down into 100 equal parts called "points"; 75 points equal 3/4 of a carat, 50 points equal 1/2 of a carat, etc. The significance of the weight is like the other quality grades. Rarity, now by virtue of the diamonds size and weight. Out of 250 tons of diamond ore only a single one carat diamond of gem quality may be found. The value of weight a 100 point (1 full carat) diamond of VS-1 clarity and G body color is generally worth more than an identical VS-1, G color diamond with a weight of .99 carats (less than a full carat). A one point difference in a diamond can make a difference in value.
It is important to understand that the weight of a diamond and its physical size are two different things. Even if the only difference between the two diamonds is .01 carat. Take for example two (2) VS-1, G quality grade 1.00 carat diamonds to show the vast difference in value that the cut will make. One of these diamonds could have the Ideal 6.5 millimeter diameter size one would expect to see in for a 1.00 carat diamond. In the other example, the second 1.00 carat diamond may have only a 5.5 millimeter diameter. Because of this one millimeter diameter size difference, and yet the same carat weight, the smaller diameter diamond would be worth somewhere around 20% less than the Ideal cut diamond of the same weight and quality grade.
These value differences will vary depending upon the size and quality grade of the diamond you may be interested in. This leads us to the fourth quality grade which is the diamonds cut. Every Diamond belongs in a weight grouping class for a range of weight where the prices per carat for each Color and Clarity group combination are listed. The main reason for this is obviously due to rarity in nature, but current market conditions at any specific time plays a very important role. Some sizes and shapes fall in and out of demand due to what is fashionable or considered affordable in society. Because of this, some size groupings for a given shape may have a higher demand and price per carat than one expects, given its rarity in nature.
So to simplify, a diamond in the 1 carat class (1.00-1.49) usually costs more per carat than a diamond less than 1 carat in weight (0.90-0.99). A diamond that is 1 full carat in size, has a higher demand, which causes it to be priced higher. The result is rough stones that could possibly have been cut into beautiful smaller stones are usually cut into not so beautiful 1 full carat stones to get into the higher price range. There are other factors and trade-offs this is just a simplified answer to the reason the cost per carat goes up as the size goes up.


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COLOR


COLOR GRADING arbitrarily begins with "D" to avoid confusion.  "A", "B", and "C" are assumed to not exist but there is room in the color range to allow for finding them. With grades "A", "AA", or "AAA" how do you know which one is the brightest white color?  Diamonds are color graded by a gemologist against a master set of colors.
  • D-F - the finest & brightest colorless diamonds, usually for the discriminating customer who can afford the most beautiful and the rare.
  • G-H - very white & bright face-up, near colorless diamonds that are not as expensive, and when mounted in jewelry it is difficult to see the the difference between these and the higher color grades.
  • I-J - not quite as bright or have very slight hardly noticeable tint.
  • K-L - have a slight tint even the average person will begin to notice.
  • M - or Lower the color will be noticed.
  • Each grade can have a 10-15% variance in it's price range for a given size group, down to M, and then it changes again depending on the Hue & Color for the Fancy Colored Diamonds.

    Diamonds occur naturally in all spectral colors, from red to blue, however the most commonly occurring colors are yellow and brown. The amount of color a diamond possesses is graded by an alphabetical scale D through Z. They began at D in case a whiter diamond was later found.  Color & Cut are the two factors that influence a diamond's beauty the most.

    Color should reflect one's tastes and budget.  i.e.: You may be able to go with a higher color grade and lower clarity grade to suit your taste and stay within budget.

    Diamonds of a colorless grade in the D-F range are much more valuable than diamonds in the L-P range because of the rarity of these colorless diamonds. This is not to say that the diamonds in the lower color range are not pretty, they can have just as much brilliancy and sparkle but with a stronger color tone. The effects of color to the cost of a diamond can be dramatic. Two diamonds of the same weight, clarity , size and shape can have a cost difference of over 100% for the difference between an F body color to a J body color . Color can only be graded accurately if the diamond is un-mounted or "loose" and it is highly recommended that the diamond be independently certified for its color as well as the other following quality grades. The color of your diamond will be simply a matter of personal taste and if you don't like the color - just plan to spend more money!

    Another color factor to consider is Fluorescence, properly called photo-luminescence.  Fluorescence is caused by a trace amount of the element boron found in the diamond. It is activated by UV light.  Fluorescence in a diamond is usually described on a certificate (GIA, EGL, etc.) as None, Faint, Medium, Medium blue, Strong, Strong blue and Intense Blue. Other colors of fluorescence do occur, yellow and white for example (try to avoid them), but it is the blue we are most commonly involved with.  In the old days people used to come looking for the perfect "blue-white" diamond. The blue referred to the fluorescence and the white to the diamonds body color.  Some people think diamonds exhibiting fluorescence is out of fashion, but Gems and Gemology (put out by GIA) GIA states that typically fluorescence is a plus in a diamond.  Most people feel that fluorescence is beautiful and rare in a diamond, so in a few years fluorescent diamonds may be back in fashion and will demand a premium.  If you want a diamond that exhibits fluorescence be sure you examine it under all light conditions, especially direct sunlight and a jewelers black light, since some fluorescent diamonds will actually become hazy in the sunlight and others will glow in a black light environment (including a dance floor) if the fluorescence is Intense (and sometimes Strong).  With Strong or Intense fluorescence I advise you to fully examine the stone, each diamond will exhibit its own traits, and in many cases these traits will have a positive effect, often causing the diamond to have a little "extra life" in the sunlight.  If you are dealing with a diamond of D, E, or F color, fluorescence is usually a negative since it won't make it look whiter, and may make it look a bit hazy in sunlight.  On the other hand, if you are dealing with a diamond in G, H, I, J, or K color, fluorescence is normally a plus, and will whiten the diamond one or more grades, thereby increasing the diamonds beauty and desirability.

    So to sum up, examine any diamond with fluorescence under all light forms and make up YOUR mind for YOURSELF, as to whether it is a plus or minus.

    diamonds

    COLOR GRADING SCALES
    COLOR GIA* CIBJO*
    COLORLESS D EXCEPTIONAL WHITE+
    E EXCEPTIONAL WHITE
    F RARE WHITE+
    NEAR COLORLESS G RARE WHITE
    H WHITE
    I VERY SLIGHTLY TINTED WHITE
    J SLIGHTLY TINTED WHITE
    FAINT YELLOW

    to

    FAINT BROWN

    K TINTED WHITE
    L
    M TINTED COLOR 1
    VERY LIGHT YELLOW

    to

    VERY LIGHT BROWN

    N TINTED COLOR 2
    O
    P
    Q
    R
    LIGHT YELLOW

    to

    LIGHT BROWN

    S TINTED COLOR 3
    T
    U
    V
    W
    X
    Y
    Z
    CHAMPAGNE
    COGNAC
    GREENISH
    BROWNISH
    YELLOW
    C+ FANCY COLOR
    LIGHT FANCY
    CANARY YELLOW
    GREEN
    BLUE
    PURPLE
    PINK
    RED
    FANCY
    FANCY INTENSE
    VIVID
    * GIA = Gemological Institute of America. 
    * CIBJO = Confederation Internationale de la Bijouterie, Joaillsrie, Ortevrerie, des diamants, perles et pierres precieuses.

     

    Dollar Cost effects of Fluorescence
      IF to VVS grades VS to SI grades I-1 to I-3 grades
    D E F colors strong  -10%

    moderate  -5%

    weak  -0%

    strong  -5% to -10%

    moderate  0% to -5%

    weak  -0%

    -0%
    G H I J colors strong  -5% to -10%

    moderate  -0% to -5%

    weak  -0%

    strong  -0% to -5%

    moderate  -0%

    weak  -0%

    -0%
    K L M colors strong  -0 to -5%

    moderate  -0%

    weak  -0%

    strong  -0%

    moderate  -0%

    weak  -0%

    -0%

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    CLARITY


    In plain terms clarity is simply how much "stuff" is inside the diamond crystal. The less the "stuff" the more they cost. This again because of rarity by lack of imperfection. Most all of the diamonds mined have inclusions that are visible to the unaided eye. A typical retail jeweler may sell a flawless clarity grade diamond once every 10 years, maybe!

    This scale ranges from FL to I-3. This entire scale can be divided in half, with diamonds that you can visually see the imperfections to the unaided eye, and diamonds that require 10 power magnification to see the imperfections. This division is at the I-1 clarity grade to the SI-2 clarity grade. The I-3 clarity grade will generally contain enough imperfection to dramatically reduce the amount of brilliancy and sparkle and should not be considered for "fine jewelry". However there can even be a good , as well as bad I-2 or I-1 clarity grade diamond. As an example a good I-1 clarity grade diamond would have an imperfection to the side which would be eye visible, however after being set would be covered by a prong or other feature of the setting. The less desirable I-1 clarity grade diamond would possess a very similar inclusion however because of its location would not be able to be hidden. An eye visible inclusion such as this would later prove to be a distraction to the beauty of the diamond. As with the color of the diamond , clarity is very much personal taste and if you don't like the number of imperfections - just plan to spend more money!

    diamonds

    CLARITY GRADING SCALES
    FL FLAWLESS
    describes diamonds in which a gemologist under favorable lighting conditions, cannot see any inclusions at ten power magnification
    IF INTERNALLY FLAWLESS
    describes diamonds which have no internal characteristics observable under the the same conditions as (FL), but which have minor surface blemishes that do not penetrate the stone.
    VVS1 VERY, VERY SLIGHTLY INCLUDED
    describes diamonds that have very, very small inclusions which are difficult for a gemologist to see at 10x magnification.
    VVS2
    VS1 VERY SLIGHTLY INCLUDED
    describes stones with very small inclusions which can be difficult to observe with 10x magnification. Inclusions are barely visible to the unaided eye, except on some larger stones or large Emerald Cuts.
    VS2
    SI1 SLIGHTLY INCLUDED
    describes stones with small inclusions which are usually obvious when viewed with 10x magnification. Inclusions are difficult to see with the unaided eye, except on larger stones or occasionally with Emerald Cuts.
    SI2
    SI3
    I1 IMPERFECT or PIQUE
    describes stones with medium to large inclusions (Piques) which are usually obvious to a gemologist with the unaided eye.  An I1 may have inclusions barely visible or located to the side while an I2 will have numerous inclusions that may be centerally located.
    I2
    I3

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    CUT


    The Cut is the most important characteristic of a diamond. This factor determines how much light which enters the diamond from above, then how much light will be reflected and refracted back out of the gem to the eye of the observer.  In other words how pretty the diamond can be is decided by the cut.  For the consumer it is fairly easy to determine in general terms if a round brilliant cut diamond is well cut or proportioned.  The first and easiest characteristic to evaluate is to compare the diamonds weight with the proper diameter size listed in the "Size to Weight Ratio Chart "below.  At the turn of the century, a young Belgian mathematician, Marcel Tolkowski, came up with what is now called the "Ideal cut" for round diamonds. His formula in essence says that if an ideal cut diamond has a 1.00 carat weight, then its proper diameter size should be between 6.3 to 6.5mm. This is the first and easiest characteristic to evaluate.  The rest of the characteristics, that are equally important, such as depth% and table%, polish, symmetry can also easily be determined by comparing the information in the tables below with the information provided on the certificate of the diamond you are interested in.

    Size to Weight Ratio Chart
    Size to Weight Ratio Chart

    Generally if the size to weight ratio are cut correctly the entire bottom side of the diamond is turned into a mirror.  If the cut has been poorly done, even the highest quality grade diamond will look lifeless. As an example, in the illustration below, lets assume that each of these diamonds has a carat weight of 1.00 carats.  The ideal cut diamond model in the center will have a diameter measure of 6.3 to 6.5mm and will reflect light to its optimum. The shallow cut model on the left may measure 6.7 to 7.0mm, so it will look like you are getting a larger diamond, but this stone will "leak" light and not be as bright as an ideal cut. The deep cut diamond on the right (the most common cut), will appear to be a smaller diamond, maybe have the physical size of a .80 to .90 carat diamond, measure somewhere around 6.0mm, this stone will also "leak" light and not be as brilliant as an ideal cut.  These diamonds are not cut this way because the cutter is unskilled, the cutter buys diamond just like you, by the "carat" and it's his job to return the most carat weight he can in a finished diamond.

    Typical Cuts Chart
    Shallow Cut
    Ideal Cut
    Deep Cut
    Shallow cut
    Ideal cut
    Deep cut

    As in this illustration the "shallow cut" diamond has been cut too wide and shallow for its weight and the light will escape out the back or pavilion of the gem. In the "ideal cut" the diamond has been correctly cut and the light entering the diamond will return to the eye.  The "deep cut" diamond has been cut too narrow and deep and again looses the light out the pavilion.  Diamonds are cut by the manufactures to yield the greatest amount of carat weight from the rough, which they also buy by the carat.

    It is therefore in the best interest of the cutter to cut for weight, not for proportions. Consumers are generally not informed about cut and its relation to value, cost, and beauty.

    Now let's evaluate the cut.  This includes the depth percentage, table percentage, crown angles, crown height, girdle thickness, pavilion depth, culet size, finish, symmetry and polish.  All of these factors are just a simple comparison of the data in the "Typical Diamond Proportion Analysis Chart" below, and with the laboratory certificate of the diamond you are interested in.  When ordering your diamond, we will be happy to explain all of these individual quality grades in more detail.  The Proportion Tables below will give you the industry parameters for Round brilliant cut diamonds as well as Marquise, Pear, Emerald, Princess and Ovals. Understanding the cut of a diamond is very important, as two diamonds with the exact same quality grades can have a 30% difference in cost because of the cut.

    Typical Diamond Proportion Analysis Chart
    Diamond Proportion Analysis Chart

    When purchasing a 1.0 carat or larger Diamond, we strongly recommend a
    Gemological Laboratory Certificate and/or Appraisal prior to purchase.
    We use fully accredited Gemological Laboratories able to perform
    Diamond Identification, Diamond Grading, and Appraisals of Gems and Jewelry.

    The following links are to reputable Gem Laboratories and Appraisers (in Alphabetical order)

    AGS | EGL | EGL ASIA | GIA | GUILD | IGI | SSEF


    Proportions for Round Brilliant cut Diamonds
    Components AGS 000 Ideal Proportions Near Ideal Proportions
    Total Depth 61.6 - 62.7% 60.1 - 62.8% 57.0 - 65.0%
    Table Diameter 54.0 - 57.0% 53.0 - 58.0% 51.5 - 60.0%
    Girdle Thickness thin to medium  very thin to medium very thin to thick
    Culet Size none none to medium none to sl. thick
    Crown Angle 34.5 degrees 33 - 35 degrees 30 - 35 degrees
    Crown Height variable 16.2% 11.0 - 16.2%
    Pavilion Angle 40.75 degrees
    Pavilion Depth 43% 43.1% 41.5 - 45.5%
    Symmetry excellent excellent to very good  excellent to good
    Finish excellent excellent to very good excellent to good

    Proportions for Princess, Emerald and Radiant
    Components Ideal Proportions Near Ideal Proportions
    Total Depth 58.0 - 75.0% 56.0 - 82.0%
    Table Diameter 57.0 - 78.0% 54.0 - 85.0%
    Girdle Thickness thin to thick thin to thick
    Culet Size N/A N/A
    Crown Angles 30.0 - 37.5degrees 29.0 - 38.0degrees
    Crown Height N/A N/A
    Pavilion Depth N/A N/A
    Symmetry excellent to very good  excellent to good
    Finish excellent to very good excellent to good

    Depth proportions are measured from the diamond's narrowest measurement
    The Ideal shape for Princess cut is @1.0 x 1.0, +/- 10%
    ie: 6mm x 6mm to 6mm x 6.60mm
    The Ideal shape for Emerald and Radiant cuts are 1.30 x 1, up to 1.40 x 1
    ie: 9mm x 7mm, or, 7mm x 5mm, etc.

    Many wonder what the difference is between the Princess cut and the Radiant cut... well, they are actually the same cut.  The difference is in the shape of the stone.  As you can see from the notations above, Princess cut is "1.0 x 1.0, +/- 10%" so they would be very square in shape.  A Princess cut becomes a Radiant cut when it starts getting more rectangular.  In other words, if the stone measures 7.0mm x 7.7mm (within 10% of being square) it's still a Princess cut, but if it were 7.0mm x 7.8mm, and anything beyond that, it should rightfully be called a Radiant cut.  A well proportioned Radiant cut or Emerald cut should be between 1.0 x 1.3, up to 1.0 x 1.4 (example: 7.0mm x 9.1, up to 7.0mm x 9.8mm). Typically the Princess cut also has square corners, rather than the cut corners normally seen on the Radiant and the Emerald cut.


    Proportions for Marquise, Oval, Pear & Hearts
    Components Ideal Proportions Near Ideal Proportions
    Total Depth 57.0 - 65.0% 53.0 - 69.0%
    Table Diameter 52.0 - 64.0% 51.0 - 66.5%
    Girdle Thickness thin to sl.thick thin to thick
    Culet Size N/A N/A
    Crown Angles 33.0 - 34.0 degrees 31.0 - 36.0 degrees
    Crown Height N/A N/A
    Pavilion Depth N/A N/A
    Symmetry excellent to very good excellent to good
    Finish excellent to very good excellent to good

    Depth proportions are measured from the diamond's narrowest measurement
    The overall shape considered as "Ideal" for Marquise diamonds is 2 to 1
    i.e: 5mm wide and 10mm long
    The Ideal shape for Oval cut is 1.30 x 1, up to 1.40 x 1
    i.e: 9mm x 7mm, 7mm x 5mm, etc.
    The Ideal shape for Pear shape cut is 1.30 x 1, up to 1.40 x 1
    i.e: 9mm x 7mm, 7mm x5mm, etc.
    The "Ideal" shape for a Heart shape cut is 1 to 1
    i.e: 6mm x 6mm


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    SYMMETRY


    Symmetry refers to how well the facets of a diamond align and intersect. This includes extra factes, badly shaped facets, off center culets and tables, and/or wavy girdles.
    A diamond with fair to poor symmetry may misdirect light that travels into the diamond, sending it off at slightly wrong angles, and thereby reducing the diamond's brilliance. Often, a diamond cutter will purposefully allow a minor reduction in symmetry as a way of preventing a defect present in the rough stone from being retained as part of the finished diamond.
    GIA graded diamonds display a symmetry grade using the following scale:

    Excellent No symmetry defects visible at 10x magnification.
    Very Good Any defects are extremely difficult to see at 10x magnification.
    Good Any defects are difficult to see at 10x magnification.
    Fair Defects are noticeable at 10x magnification, and may be visible to the naked eye.
    Poor Defects are visible to the naked eye.

    A symmetry grade of Excellent to Good should not be used as a primary factor in choosing a diamond, since each of these grades is possible in diamonds of exceptional appearance.
    Symmetry is really more important for diamonds in the VVS2 clarity range and higher, since the very subtle defects produced by Fair or Poor symmetry (which can look like they are small inclusions) may compromise the diamond's otherwise flawless appearance.
    Even though symmetry does have a minor impact on appearance, it has a significant impact on price. ie. A diamond with Excellent Symmetry and Polish can carry a price of around 10%-15% higher than one having Good Symmetry and Polish. This is an added cost that is more of a perceived value of an "excellent" grade, rather than the actual effect on the diamond's appearance.
    Typically diamonds with Poor symmetry have defects that are visible to the naked eye, and they should be avoided in all cases.
    Our recommendation is that a diamond should not be chosen or rejected based solely on symmetry. The overall Cut grade already incorporates symmetry, so symmetry should not be used as the primary determinant when choosing a diamond. it is only when you are comparing two diamonds of equal Color, Clarity, and Cut that Symmetry is used as a determining factor when making a selection.


    POLISH


    Polish refers to the degree of smoothness of each facet of a diamond as measured by a gemologist. When a diamond is cut and polished, microscopic surface defects may be created by the polishing wheel as it drags tiny dislodged crystals across the diamond's surface. Depending on the severity, these defects may disrupt light patterns as the light rays enter and exit the diamond.
    Each Lumera Diamond displays the polish grade as determined by the GIA, using the following scale:
    GIA graded diamonds display a polish (or finish) grade using the following scale:

    Excellent No polish defects visible at 10x magnification.
    Very Good Any defects are extremely difficult to see at 10x magnification.
    Good Any defects are difficult to see at 10x magnification.
    Fair Defects are noticeable at 10x magnification, and may be visible to the naked eye.
    Poor Defects are visible to the naked eye.

    Diamonds having a polish grade of Excellent to Good will not have polishing defects visible to the naked eye, and should have no impact on the diamond's overall appearance.
    A polish grade of Fair is acceptable for diamonds with clarity grades of I1 or lower, mainly because they already possess so many internal inclusions that are visible to the naked eye that the polish has far less relevance.
    Diamonds that are 0.75 carats and smaller, can have a polish grade of Fair or better since the polish will not adversely impact the appearance of the diamond to an untrained observer.
    A polish grade of Poor should be avoided, regardless of the size or clarity of the diamond.


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    CE and HTHP


    Clarity Enhanced (CE) Diamonds are totally natural Diamonds that have been treated with a New Clarity Enhancement Process. This new revolutionary process optically eliminates "feathers" (inclusions), which are naturally occurring imperfections found in most diamonds.

    High Pressure High Temperature (HPHT) Diamonds are also totally natural Diamonds that have been treated with a complex process that involves heating the stone while it's under pressure until the desired alteration of color and/or clarity is evident. This treatment is only performed on certain diamonds.

    The results are more visually stunning diamonds that you can purchase for significantly less than a similar-looking, non-enhanced diamonds, where only you and your jeweler will ever really know that you own a CE or HPHT Enhanced Diamond.

    CE and HPHT Diamonds are both natural diamonds from deep in the heart of the earth which have been technologically enhanced to become as brilliant, clear and beautiful as modern science can make it.

    When light travels from one medium to another, it either changes its course or reflects in a different direction. When light attempts to pass through a non-enhanced diamond that may have typical feather inclusions, the light hits the feather and reflects off in any number of directions. The more feathers, the more the diamond appears to be non-transparent. With a CE or HPHT diamond, the light passes THROUGH the natural inclusions, because the material used for the enhancement has the same optical characteristics as the diamond. The beam of light "thinks" it's still traveling through the same material (diamond) and continues its original course. The amount of material used to fill the feather is so minute that the Gemological Institute of America (GIA) has reported that the clarity enhancement process ADDS NO WEIGHT to a diamond.

    This treatment method is permanent and normally does not create special care requirements.

    Clarity Enhanced (CE) as well as High Pressure High Temperature (HPHT) Diamonds are normally GUARANTEED FOR LIFE by the manufacturer.

    The CE clarity enhancement is permanent and is not visible to the naked eye, except the only things likely to compromise the integrity of your CE diamond's enhancement are the flame of a torch or boiling acids and bases. In the unlikely event your CE diamond should lose its enhancement, usually the manufacturer will restore the enhancement of your diamond, free of charge.

    The HPHT clarity enhancement is totally permanent, even with the flame of a torch or boiling acids and bases.

    You can usually expect to pay 15% to 25% less than what you'd pay for a natural Diamond for the same color and clarity.


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