Overview and commentary on the June 2013 Rock & Gem article, “Ammolite: An Organic Jewel.”

Juliet Weir-de La Rochefoucauld's book presents a selection of international contemporary jewelry designers.

The rarity and value of faceted wurtzites from Tanzania are sure to draw the attention of gem collectors.

Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitized feather inclusions.

This black diamond's color was produced by natural radiation stains, an unusual cause of color.

Silicon, normally associated with CVD synthetic diamond, may be found in natural diamond.

Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.

Myanmar’s Kyatpin Valley yields an fascinating gemstone association.

A yellowish green crystal inclusion in a ruby is found to be vesuvianite.

A newly discovered mineral, crowningshieldite, was accepted on September 18, 2018, by the International Mineralogical Association.

Researchers gathered at the 22nd meeting of the International Mineralogical Association (IMA) to discuss several colored stone topics ranging from treatments to the latest advancements in understanding gem minerals.

Unusual needle-like inclusions in ruby were identified as sillimanite.

Single irradiated CVD synthetic was identified in a parcel of irradiated natural melee diamonds in the Tokyo lab.

Manufactured gold-in-quartz jewelry was examined in the Carlsbad lab.

Declared synthetic diamond identified as natural in the Carlsbad lab.

An unexpected manmade feature is found in a pink sapphire from Myanmar.

A boulder opal contained an unusual carpet of needle-like lepidocrocite inclusions along the interface between the opal and the ironstone matrix.

Considerable confusion exists in the trade about the important differences between trademarks and patents.

A response to the Summer 2014 G&G article on three-phase inclusions in emerald.