A parcel of a few diamonds came to GSI for testing. Size of diamonds ranges from 0.40 – 0.70 Cts. Diamonds graded as high clarity and near colorless.
Visual examination was difficult to identify because natural diamond and laboratory grown diamonds has identical properties.
Preliminary testing indicated that a few diamonds from the parcel required further testing.
Inclusions: Less than 10X and 30X clouds and pinpoints like inclusions on the table were observed in some of the diamonds.
In some of the diamonds feather like or surface reaching inclusions on girdle were observed.
Green fluorescence show growth layers along with the phosphorescence. The fluorescence patterns characteristics of near-colorless lab grown diamonds. These features are typical for CVD grown diamonds.
Lab grown diamond’s detection requires advanced equipment, theoretical knowledge and practical experience. Without these conditions, the detection is impossible.