Gem treatment disclosure and U.S. law
In recent years, the obligation to fully disclose all gem treatments has changed from a mere ethical responsibility to a legal one.
Obtaining U.S. copyright registration for the Elara square cut-cornered brilliant diamond
The US Copyright Office granted what is believed to be the first copyright registration covering a gemstone design.
A New Method for Imitating Asterism
Several gems were recently examined that showed stars with an unnatural appearance or an unusual number of rays.
Synthetic Moissanite: A New Diamond Substitute
Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterise it.
Gemmological Properties of Near-Colourless Synthetic Diamonds
Examination of 51 colourless to near-colourless synthetic diamonds from all known sources of production confirms that they can be distinguished from similar-appearing natural diamonds on the basis of their gemmological properties.
Dyed Natural Corundum as a Ruby Imitation
The gemmological properties of a new ruby imitation, produced by dyeing natural colourless to pale-coloured corundum, are described.
An Examination of Nontransparent “CZ” from Russia
White, pink and black nontransparent synthetic "cubic zirconia" is currently being manufactured in Russia and marketed primarily in cabochon and bead form.
Majorica Imitation Pearls
The Majorica S.A. product is remarkably similar in appearance to saltwater cultured pearls.
Mildly Radioactive Rhinestones and Synthetic Spinel-And-Glass Triplets | Gems & Gemmology
Low levels of radioactivity were found in some greenish yellow to yellow-green (peridot-like) synthetic spinel-and-glass triplets, mirror-backed glass rhinestone chatons and fully fashioned glass rhinestones.
Man-Made Jewellery Malachite
Man-made malachite holds much promise for use in stone cutting and the jewellery trade.