Research Article Search Results
GIA 7 Pearl Value Factors: An Update on Nacre Classification
A new nacre scale is established in the GIA 7 Pearl Value Factors classification system.
Unusual Patterns in Diamonds Composed of Dark Micro-Inclusions
Two natural diamonds exhibiting dark micro-inclusions are compared in the Carlsbad laboratory.
Emeralds and Beryl from Kazakhstan and Ukraine
A report from GIA’s Carlsbad laboratory on emerald and beryl samples studied as part of an ongoing beryl characterization research project.
Eighth Annual Gianmaria Buccellati Foundation Award Winner
A graduate of GIA’s Jewelry Design program in London is the recipient of the 2024 Gianmaria Buccellati Foundation Award.
Gems Keep Giving
The nonprofit organization Gems Keep Giving aims to improve global small-scale mining and gem-cutting communities.
Evil Eye in a Flux-Healed Mong Hsu Ruby
The mirror reflection of a flux-healed fissure from a step pavilion facet in a Mong Hsu ruby creates an interesting inclusion scene.
Update on Montana’s Rock Creek Sapphire
Potentate Mining expands its mining operation and hosts the first Montana sapphire tender in Bangkok.
Irreversible Photochromism in Synthetic Sapphire
The first documented case of corundum with irreversible photochromism encountered at GIA.
Devitrified Glass “Pom-Poms” in Ruby
Devitrified glass inclusions resembling pom-poms or sea urchins are observed in a clarity-enhanced ruby.
Natural Non-Nacreous Pearls from Various Marine Mollusks
The Bangkok laboratory studies 35 loose non-nacreous pearls from a wide range of marine mollusk species.
Spiral Patterns on a Non-Nacreous Pearl
A 6.79 ct orange pearl displays a fascinating spiral pattern.
