News Archive

Book Review – Gem Testing Techniques

Gem Testing Techniques By Alan Hodgkinson Published by Valerie Hodgkinson First printing limited edition 1,000 copies 552 full color pages £128 in the UK, higher elsewhere www.gemtestingtechniques.co.uk   On a Friday in early May, Alan Hodgkinson unveiled his much anticipated book Gem…

Benitoite

Introduction and History: Benitoite is barium titanium silicate, BaTi(Si3O9). Mindat.org lists several localities for benitoite including the Czech Republic, Japan, Arkansas and Montana, but it is well known that the only source of gem quality…

Colored Stone Market

In the US market, prices for an increasing number of colored stones have stabilized during the second quarter thus breaking the upward trend observed during much of the past five years. This leveling off was…

Tugtupite

Introduction: Tugtupite is an interesting and rarely seen gem, closely related to sodalite with the formula, Na4(AlBeSi4O12)Cl. It was discovered in 1957 by Professor H. Sørensen in the coastal cliffs of Tugtup Agtakôrfia on the…