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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The New York lab received four baroque-shaped pearls with damaged nacre layers
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A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.
Read MoreAn unusually large cultured pearl was filled with multiple cultured pearls, perhaps after the emergence of an original single-bead nucleus.
Read MoreObserving 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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