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Non-nacreous Pearls
Natural Pearls Reportedly from a Spondylus Species (“Thorny” Oyster)

A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.

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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.

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Atypical Freshwater Cultured Pearls with Damaged Nacre

The New York lab received four baroque-shaped pearls with damaged nacre layers

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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.

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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.

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