Examination of a 3.91 ct drop-shaped cabochon, purchased in India as a Larimar imitation.
Obtaining U.S. Copyright Registration for the Elara Square Cut-Cornered Brilliant Diamond
The U.S. 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.
Celebrating 75 Years of Gems & Gemology
Gems & Gemology, the professional quarterly of GIA, debuted in 1934
Gemological Properties of Near-Colorless Synthetic Diamonds
Examination of 51 colorless to near-colorless synthetic diamonds from all known sources of production confirms that they can be distinguished from similar-appearing natural diamonds on the basis of their gemological properties.
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 & Gemology
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 Jewelry Malachite
Man-made malachite holds much promise for use in stone cutting and the jewelry trade.
Dyed Natural Corundum as a Ruby Imitation
The gemological properties of a new ruby imitation, produced by dyeing natural colorless to pale-colored 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.