India is emerging as a source of gem-quality kyanite.

The first documented UV-reactive chemical treatment to make opal appear tenebrescent.

In 2006, emeralds were discovered in the Fazenda Bonfim region of northeastern Brazil.

A large number of natural-color yellow diamonds are analyzed using grading and appearance aspects among other characteristics to clarify the differences between them and the light yellow diamonds associated with GIA's D-to-Z color grading scale.

Transparent rhodonite is considered one of the most difficult of all gems to facet because of its perfect cleavage and brittle, uneven fracture.

A large “Persian” turquoise cabochon was impregnated with a material that was also present in cavities on its base.

An emerald deposit at Byrud, in southern Norway, yielded significant quantities of crystals and gem rough in the late 19th and early 20th centuries.

By Ulla Tillander-Godenhielm, 295 pp., illus. publ. by Unicorn Press, London, 2012. US$80.00

At the Riverpark Inn show in Tucson, gem dealer Tom Schneider (San Diego, California) exhibited a parcel of kyanite displaying an unusual saturated yellowish green color.

A prasiolite specimen displaying Brazil-law twinning, usually seen in the amethyst variety of quartz, is examined.

A specimen presenting as red coral is revealed to be dyed bone.