New Find of Deep Blue Aquamarine from Nasarawa State in Nigeria
Nigerian aquamarine with exceptionally deep and saturated color also displays unusually strong pleochroism.
A Near-Round Natural Pearl Discovered in the Edible Oyster Magallana bilineata
An edible oyster from the Hab River Delta of Pakistan reveals a natural pearl.
Natural-Color Fancy White and Fancy Black Diamonds: Where Color and Clarity Converge
A systematic study of the properties of approximately 500 Fancy white and 1,200 Fancy black diamonds.
Possible Natural Abalone Shell Blister
An intriguing item was sent by KC Bell to GIA’s Carlsbad laboratory for examination.
Black Non-Nacreous Pearl Imitations Made of Beads Cut from Shell
The DANAT laboratory recently encountered two natural black color beads cut from an unknown mollusk.
Characteristics of Hydrothermally Treated Beeswax Amber
Reveals the process for hydrothermal enhancement of amber and the means of detection.
Quarterly Crystal: “Ball Bearing” in Quartz
Quartz crystals with three-phase fluid inclusions from the Jinkouhe mine in the Sichuan Province of China have been sold for many years at gem and mineral shows such as those held annually in Tucson, Arizona.
Mineral Inclusions in Ruby and Sapphire from the Bo Welu Gem Deposit in Chanthaburi, Thailand
Identifies mineral inclusions in corundum from this locality for comparison with other global deposits.
Faceted Diamond Octahedron with a Remarkable Stellate Cloud Inclusion
A remarkable inclusion scene in diamond is showcased by an unconventional cutting style.
The Rare Sun Diamond
An eye-visible cloud with a star-like pattern is highlighted by the cut of the Rare Sun diamond.
Cobalt-Coated Sapphire
The New York lab recently identified a sapphire entirely covered with a cobalt coating to enhance its blue color.
Gemstone Portrait Artist Angie Crabtree
The 2019 AGTA show in Tucson featured the work of a gemstone portrait artist.
Trapiche Emerald from Swat Valley, Pakistan
Minute platy magnetite inclusions in these emeralds from Pakistan could help advance our understanding of trapiche.
Blue Gahnite from Nigeria
LA-ICP-MS analysis helps researchers better understand the composition of this type of spinel from Nigeria.
Dendritic Inclusions of Thorianite in Heated Blue Sapphire
Recently, a 2.05 ct blue sapphire was sent to Guild Gem Laboratories for identification.
Pressed Gibbsite and Calcite as a Rhodochrosite Imitation
Examines a new rhodochrosite simulant composed of pressed gibbsite and calcite powder.
Effects of Mollusk Size on Growth and Color of Cultured Half-Pearls from Phuket, Thailand
Determines methods for maximizing production and quality of cultured half-pearls.
Hydrogen-Rich Green Diamond Color-Treated by Multi-Step Processing
Characterization of an intense yellowish green faceted diamond revealed a complex treatment process.
Gemstones in the Era of the Taj Mahal and the Mughals
A look at the gem ornamentation of this landmark, as well as the jewels of the Mughal dynasty.
Unique Vanadium-Rich Emerald from Malipo, China
Spectroscopic and chemical analyses of emeralds from this Chinese deposit show a unique composition.
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