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Gem Focus - June 2021

Posted on June 7, 2021 by Çiğdem Lüle, PhD, FGA, GIA GG, DGA

Brightly colored crystals of fluorite, a.k.a., fluorspar, in large sizes have been a prized possession of mineral collectors for hundreds of years. This calcium fluoride mineral was first named by Carlo Antonio Galeani Napione in the late 18th century. He was inspired by the Latin word “fluere” meaning “to flow" because the mineral is used as a flux in iron smelting for industrial purposes.


News Archive

Gem Focus – May 2021

Gem quality feldspar species are more commonly sought as collectors’ stones and seldom for jewelry since they are not very durable. They tend to be colorless, light yellow, sometimes gray. The unusual variety of microcline feldspar, which displays an attractive greenish blue color is called amazonite.

Pink Diaspore

Much of the pink diaspore rough seen to date has areas capable of cutting medium to large size stones that are eye clean and in many cases loupe clean

Red and Hot Purple Tourmaline

Unheated and vividly colored purplish red cuprian tourmalines have gained a special niche and become more of a collector’s stone, while rubellite remains one of the favorite tourmalines in the market.

Gem Focus – April 2021

Value of pyrite is as diverse as its use. While pyrite crystal specimens or pyritized fossils from famous localities would fetch thousands of dollars, small faceted pieces or beads would be sold in bulk for a few dollars only. Naturally, any custom jewelry piece would be valued based on the design and the designer, not the pyrite itself.

Colored Gemstone Market Trends in Uncertain Times Webinar Series: April 2021

Our guest is Roland Schluessel, FGA of Pillar & Stone International. Roland has built his business by supporting his trade clients with fine colored gems that he has sourced directly on location. His booth in Tucson is a favorite destination for GemGuide researchers because of his knack for recognizing popular trends in colored stones before they take shape.