Emerald-cut diamond, 17.62 cts. Platinum, size 6, accompanied by a GIA type classification letter
GIA Report D color, VVS1 clarity, type IIa
Catalogue Essay
DIAMOND TYPE CLASSIFICATION FOR GIA DIAMOND GRADING REPORT #8259070
Scientists classify diamonds into two main "types" - type I and type Il - based on the presence or absence of nitrogen which can replace carbon atoms in a diamond's atomic structure, These two diamond types can be distinguished on the basis of differences in their chemical and physical properties. Type I diamonds contain little it any nitrogen and they are subdivided into two groups (lla and Ilb) both of which are quite rare (less than 2% of all gem diamonds), According to the records of the GIA Laboratory, the 17,62 carat Emerald Cut diamond described in GIA Diamond Grading Report #8259070 has been determined to be a type lla diamond, Type lla diamonds are the most chemically pure type of diamond and often have exceptional optical transparency. Type la diamonds were first identified as originating from India (particularly from the Golconda region) but have since been recovered in all major diamond-producing regions of the world. Among famous gem diamonds, the 530.20 carat Cullinan I and the 105.60 carat Koh-i-noor are examples of type lla.
-Gemological Institute of America
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A Magnificent Diamond and Platinum Ring
Emerald-cut diamond, 17.62 cts. Platinum, size 6, accompanied by a GIA type classification letter
