Month: August 2015

Imperial Topaz

It is stated in this colored stone market report that imperial topaz in the best quality is scarce and prices have gone up. What used to be a few hundred dollars per carat is now…

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…