The inside of a GIA Report on colored diamonds. This one
is similar to a standard GIA Diamond Grading Report.
GIA Lab Reports- It's different
for Colored Diamonds
This Section deals with GIA & lab reports for colored diamonds. You think it was complex for colorless diamonds? You haven't seen anything yet. Remember that the GIA grades colorless diamonds upside down. However, the GIA grades colored diamonds face up, the way you'd look at a diamond in a ring, from the top.
Reports for Natural Fancy Colored DiamondsThe GIA issues several reports for natural Fancy Colored Diamonds. The first one is similar to the standard "GIA Diamond Grading Report" and is pictured in the photo to the right. Standard, in this case, means it has a clarity grade, symmetry grade and all the things you'd ordinarily see on a GIA Report for colorless diamonds.
On newer GIA reports, the design of which
was introduced 1/1/06, depth and table
measurements are presented as a diagram
The GIA Color Origin ReportThe second type of GIA Report commonly used for Natural Fancy Colored Diamonds is referred to in the trade as a GIA Color Origin Report. The "Jacket" or back portion, looks like the one below. The Color Origin Report identifies the Shape and Cutting Style, Measurements, Weight, Color Grade, (Sub-categories "Origin", "Grade" and "Distribution"), Comments (if any) and a diagram ( perfect for those adept at Rubric's Cube, otherwise useless).
The Color Origin Report omits a few specifications we're used to seeing the "Grading" reports. These include: Clarity, Depth percentage, Table percentage, Girdle, Culet, Polish, Symmetry and Fluorescence.
For diamonds in the light yellow ranges (U-V, W-X, and Y-Z), there's an interesting dichotomy. When a Y-Z color diamond is submitted for the "Full Report", GIA issues a report identical, front and back, to a D color diamond's report. Additionally on the report we refer to as a full GIA Report, the color would be identified simply as "Y-Z Range".
Remember how GIA terms this shade on the full report?
Just a plain old Y-Z Range. On a Color Origin Report,
the same diamond gets additional description: Light Yellow,
Natural Color. Important descriptors with co
If the same diamond is submitted for a Color Origin Report, you'll get the same outer jacket as a Fancy Intense Yellow Diamond (the one to the left on a yellow background)- The GIA Colored Diamond Report. The inside would have the same info as any other "Color Origin," but in a slightly different format- with a heading of "Identification report" and the additional descriptors of "Light Yellow, Natural Color".
Why would a Cutter Choose A Color Origin Report?
The Color Origin Report identifies the Shape & cutting style,
Measurements, Weight, Color Grade, Comments (if any) & a
diagram (perfect for those adept at Rubric's Cube, otherwise useless)
The additional descriptors of "Light Yellow, Natural Color" would be reason enough for a cutter of these diamonds to opt for the Color Origin Report. It gives the light yellow diamond some status. We've had many colored diamonds GIA would have graded VS1 or better with the "Origin" report.
I1 Vivid Yellow Diamond. Color can sometimes
help hide inclusions. No sparkle interuptus here.
There are times, however, when the cutter knows it will get I1, and feels that an Intense Yellow is better off without the "stigma" of an I1 moniker. Of course another possible reason for opting for a color origin could be that the diamond is an imperfect piece of junk.
AS with ALL diamonds of note, GIA or not, close physical examination by an expert is necessary to determine valuation. A Color Origin diamond might very well be a far better purchase than another Fancy Colored Diamond with a GIA report calling it Internally Flawless. We've had many I1 diamonds that are eye clean and are quite beautiful. Keep in mind that not all dealers that carry colored diamonds know what they're selling.
What about other reports?The gem grading lab for colored diamonds is the GIA. Period.
Ethical dealers won't use any such formula. Dealers will ONLY pay top dollar for any given grade, if that grade was issued by GIA. It seems that there is a problem with sellers that understand the difference between the labs purposely blurring the lines. Take a hypothetical diamond. It's legitimate grade is K/SI1. GIA gives it K/SI1. Another lab gives it J/VS2 (or I/VS2). If both dealers were charging the same price, a buyer unfamiliar with the information in this article might reasonably assume the guy selling the I/VS2 was less expensive.
When the lesser reports are used in this manner, it smells like misrepresentation. After all, if the seller knows all this stuff, and we must assume that- as a dealer they do, why not tell the buyer?