Impregnated and Dyed Turquoise
Natural turquoise has been subjected to dyeing and three types of impregnation.
A Jadeite Bangle Simulant: Hydrogrossular Garnet
Bangles submitted for identification are found to be not jadeite jade, but hydrogrossular garnet, an unusual choice for this form.
Large Star Emerald
An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.
Rare “Star and Cross” Quartz from Brazil
Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.
Serpentine Cabochon with Unusual Olive Green Color
A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.
Thai-Myanmar Petrified Woods
The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.
Color-Change Synthetic Cubic Zirconia as Peridot Imitation
A greenish yellow material set in a ring as a peridot imitation is identified as synthetic cubic zirconia.
Coral Inclusions in Plastic
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