Two Large CVD-Grown Synthetic Diamonds Tested by GIA (英语)
Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.
Large Natural Fossil Blister Pearls from Tridacna (Giant Clam) Species
Two blister pearls attached to a host shell believed to have fossilized during the later Pleistocene period and discovered in southeastern Kenya are studied.
A Natural Pearl with an Intriguing Internal Structure
A semi-baroque pearl with an unusual radial feature is submitted to the Bangkok lab for testing.
石墨内含物形成钻石的八面体轮廓 (英语)
An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.
Two Large Natural Pearls Reportedly from Spondylus and Trochoidea Species Mollusks
Natural pearls of unusual size and unique appearance are retrieved from the west coast of Mexico and examined in GIA’s New York lab.
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