Diamond with Unusual Fluorescence Distribution
A submission to the New York lab yields an unexpected reaction to long-wave UV radiation.
A Synthetic Diamond Overgrowth on a Natural Diamond
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.
Partially Hollow Tridacna Blister Pearls with Shells Attached
Blister pearls attached to shells are seen in both the Bangkok and New York laboratories.
Atypical Bead-Cultured Pearls with Unusual Nacre Growth
Bead-cultured pearls with growth patterns within the drill holes are seen in the New York lab.
CVD Synthetic Diamond Mimicking Natural Stone
A round brilliant specimen, submitted for update service, is found to be a CVD synthetic diamond with post-growth annealing.
Diamond with Concentric Inclusions
A fancy-color diamond shows inclusions that outline growth layers.
HPHT Synthetic Diamond Melee Found In Mounted Jewelry
An HPHT synthetic diamond is found among the melee in a ring.
Punsiri Heat Treatment on Basalt-Related Blue Sapphire
Immersion reveals the heat treatment of a basalt-related blue sapphire.
CVD Synthetic Diamond Mimicking Natural Stone
A round brilliant specimen, submitted for update service, is found to be a CVD synthetic diamond with post-growth annealing.