6 March 2001
AN EXCEPTIONAL DIAMOND RING
Set with a cushion-shaped diamond weighing 5.18 carats to the matte platinum hoop
With certificate 0008088 dated 22 August 2000 from the Gübelin Gemmological Laboratory stating that the diamond is D color and internally flawless clarity
Accompanied by a certificate stating the following:
Diamonds are classified into two fundamental groups based on the relative presence or absence of nitrogen incorporated into the crystal structure as determined by the infrared spectrum. Type I diamonds contain appreciable concentrations of nitrogen, whereas type II diamonds are chemically very pure and do not reveal infrared absorption charcteristics related to nitrogen.
A further separation of these two groups includes type Ia (nitrogen atoms present in pairs or groups), type Ib (isolated nitrogen atoms), type IIa (diamonds which do not reveal measurable traces of nitrogen) and type IIb (containing boron atoms).
The 5.18 ct diamond described in the Gübelin Gem Lab Diamond Report No. 0008088, based on its infrared spectrum, is classified as a type IIa.
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