Research Article Search Results
Dendritic Inclusions of Thorianite in Heated Blue Sapphire
Recently, a 2.05 ct blue sapphire was sent to Guild Gem Laboratories for identification.
Opals Revisited
Long-forgotten opals found after 27 years in storage still looked stable and ready to be worked.
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.
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.
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.
Pressed Gibbsite and Calcite as a Rhodochrosite Imitation
Examines a new rhodochrosite simulant composed of pressed gibbsite and calcite powder.
Characteristics of Hydrothermally Treated Beeswax Amber
Reveals the process for hydrothermal enhancement of amber and the means of detection.
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.
Hydrogen-Rich Green Diamond Color-Treated by Multi-Step Processing
Characterization of an intense yellowish green faceted diamond revealed a complex treatment process.
A “Hollow” Pearl Filled with Foreign Materials
Conclusively identifying the origin of a “hollow” pearl filled with foreign materials proves challenging.
Rough Diamond Crystal with an Unusual Coating of Fake Green “Radiation Stains”
The interior structures of pearls are always of interest, as they are never revealed until the analysis begins.
