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How to Read a Diamond Grading Report
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Every diamond we sell is accompanied by a GIA, AGS or IGI authentic Diamond Grading Report, commonly referred to as a Diamond Certificate. These grading reports document the characteristics and qualities of a specific diamond. Below we offer an outline of each grading report and explain the terms and evaluations listed on a typical diamond certificate.
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Shape and Cutting Style
The diamond’s shape as seen from above (round, oval, heart, pear, square, etc.) and the cutting style, or facet arrangement, (brilliant, modified brilliant, emerald cut, etc.). Refer to our Diamond Learning Center for more information on Diamond Shapes and Diamond Cut.
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Carat Weight
Lists the weight of the diamond in carats. One carat equals 1/5 gram. Please refer to our page on Carat Weight for further information.
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Clarity Grade
Evaluates the absence of inclusions and blemishes. Inclusions are internal characteristics while blemishes are external characteristics. This grade is determined by examining the diamond under 10x magnification. A Clarity Scale is provided for reference on all reports. Learn more about Diamond Clarity.
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Measurements
Reports measurements of the diamond’s dimensions in millimeters. For round diamonds, measurements are listed as ‘smallest diameter – largest diameter x depth’.
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Color Grade
Evaluates absence of color in the diamond when compared to a master colorless stone. A Color Scale is provided for reference on all reports. Visit our learning center for more information on Diamond Color and color grading.
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Cut Grade
Evaluates quality and craftsmanship of the diamond cut. Diamonds are examined face-up. Cut grade will only appear on round brilliant diamonds from reports issued after January 1, 2006. A Cut Scale is provided for reference on all reports.
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Fluorescence
Evaluates the glow of a diamond when examined under long wave ultra violet rays. Ranges from none to very strong. Low fluorescence is typically desirable, as high fluorescence is associated with lower quality and lower value stones.
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Plotting Diagram
An approximated illustration of the shape and cutting style of the diamond as seen from above and below. Symbols representing clarity characteristics (inclusions and blemishes) are plotted according to their size, type and relative location. Symbols can be identified using the Key to Symbols.
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Proportions Diagram
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Different types of Diamond Settings
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1. Prong Setting
The most common type of setting style, especially for solitaire rings, is the prong setting which holds your stone securely while still allowing a good deal of light to enter your diamond or gemstone. To increase this effect, the center stone is sometimes raised above the shank, to give it a larger, more important appearance, with only a suggestion of metal showing.
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2. Grain Setting
A seat is drilled into the metal. The stone is laid into the recess and a special tool is then used to raise a grain from the top of the ring. As the tool gouges out a small piece of gold the setter manages to push a tiny raised piece of metal over the top edge of each stone, at least two per stone. The setter then has another tool which rounds this piece of metal to give the beaded affect associated with grain work.
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3. Channel Setting
In a channel setting, diamond(s) or gemstone(s) are set flush between two strips of metal that holds them in place side by side with no additional prongs between the stones. This type of setting protects the edge, or girdle, of the gemstone, and is a very secure setting. Channel-set gemstones provide a smooth setting making them less likely to get snagged on hair or clothing.
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4. Tension Setting
This sleek, modern diamond ring setting uses pressure to hold a stone between two open ends of a metal mounting, creating the illusion that the stone is floating. This setting is a beautiful choice for any bride-to-be who appreciates modern, cutting edge style.
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5. Pressure Setting
In Pressure setting 7 or more diamonds are used , the center stone is surrounded and held by other stones. For pressure setting utmost importance is giving to circumference of the diamond while purchasing, reason being that even slightest of difference creates the possibility that the diamonds may fall.Pressure setting gives a look and feel of a solitaire diamond and hence gains more popularity.
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6. Pave Setting
Similar to channel setting, a pave ring setting has a band that is covered with dozens of tiny diamonds – so much so that the metal band barely shows through. The difference is that these diamonds are often very small and held in place with small prongs or beads. The result is a band that looks almost like it’s made entirely of diamonds, whereas in a channel setting, the diamonds are bigger, more distinct and clearly set within the metal band.
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7. Flush Setting
The flush setting is similar to a bezel diamond setting, however the top (table) of the stone is the only part exposed. Many jewelers set smaller diamonds flush in the band of a ring, creating patterns and highlights to the band, as well as the main stones. The flush diamond setting is not often used for the main stones of a ring, since it makes the diamond ‘less prominent’.
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8. Bezel Setting
A bezel setting is held in place by creating a metal frame around the circumference of the stone or at its girdle (the thin edge of the stone). It can wrap all the way around the stone or only partially surround it, depending on the style of the ring. This type of diamond ring setting is good for protecting the girdle and often makes the stone look larger.
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9. Illusion Setting
A type of prong setting, this technique adds a faceted, shiny metal plate around the girdle of a diamond or gemstone. The reflective plate makes the stone appear larger and more brilliant.
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10. Invisible Setting
Invisibly set gemstones sit very close together with their metal settings hidden underneath. So you see a continuous, uninterrupted surface of diamonds or gemstones. We think this type of setting is a great way to showcase the brilliance of princess cut diamonds, because there are no prongs or bezels blocking the light as it enters and illuminates each stone.
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