Calcium Fluoride Coating Found on 13 "Fancy" Pink Diamonds
Recent lab examination reveals that traditional treatments such as calcium fluoride coating are still prevalent in the trade, and great care must be taken to identify them.
Atypical Freshwater Cultured Pearls with Damaged Nacre
The New York lab received four baroque-shaped pearls with damaged nacre layers
Natural Pearls Reportedly from a Spondylus Species (“Thorny” Oyster)
A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.
Enormous South Sea Cultured Pearl Filled with Cultured Pearls
An unusually large cultured pearl was filled with multiple cultured pearls, perhaps after the emergence of an original single-bead nucleus.
A Useful Technique to Confirm the Hydrophane Nature of Opal
Observing a water drop’s interaction with opal, as well as refractive index, can confirm a specimen’s hydrophane nature with less risk of breakage than total immersion.