Electroformed Gold Bracelet
Examination of gold bracelet bearing a 14K hallmark reveals a wax or resin material under gold plating.
Exceptionally Rare Titanoholtite
Iridescent Imitation Pearl
Pink and Red Epidote in Quartz
Quarterly Crystal: Diamond in Diamond
Examination of a South African diamond reveals an eye-visible diamond inclusion.
A New Gem Material from Greenland: Iridescent Orthoamphibole
A Gem-Quality Iridescent Orthoamphibole from Wyoming
Update on Ammolite Production from Southern Alberta, Canada
Ammolite: Iridescent Fossilized Ammonite from Southern Alberta, Canada
Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color
Jadeite Bangle with the Appearance of Polymer Treatment
Heliodor and Aquamarine with Surface Etching
Hexagonal etch features are observed on the prismatic faces of heliodor and aquamarine crystals.
Oregon Sunstone Update
Conservation Concerns over Use of Tridacna Shell in Imitation Pearls
The New York lab investigates the use of the shells of Tridacna species as imitation pearls.
Chrysoberyl from the New England Placer Deposits, New South Wales, Australia
Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.
Visible Absorption Spectra of Colored Diamonds
Tucson: A Showcase of Colored Gemstone Innovation
Afghan Emerald, Tajik Ruby, and Clarity-Enhanced Tourmaline
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