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Quality Assessment of Natural Jadeite: Process and Tips for Appraisers

Posted on July 1, 2020 by Roland Schluessel, FGA, DGemG

Most retailers and appraisers in the Western World lack the knowledge to judge the quality parameters and value of natural untreated jadeite. This is because natural jadeite material in all qualities is scarce in the…

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Diamond Market News

The diamond market around the world, and especially in North America, has entered unknown waters as far as accurately predicting what’s coming down the pipeline. Diamond “experts” continually weigh in with their predications of what…

Cuprite

INTRODUCTION Cuprite is a mineral species, cuprous oxide, with the formula Cu2O. It was named in 1845 by Wilhelm Karl von Haidinger. The name comes from the Latin “cuprum” in allusion to its composition. Cuprite is…

Colored Stone Market

In Asia, jewelers report improving sales as consumers spend on luxury. In the USA, cautious mood greets traders as more markets emerge from COVID-19 closures. A range of colors are expected to see good demand…

Paraiba Tourmaline

Tourmaline is one of the most popular and complex gemstones and has a long history. Due to its rich chemistry and growth conditions, it comes not only in many different colors but also in unusual…

Kunzite: a rosy spodumene with an American name

Spodumene is almost exclusively a pegmatitic mineral of the pyroxene group that forms in monoclinic system with a chemical formula of LiAlSi2O6. Its hardness is 6.5 to 7 on the Mohs’ scale and displays perfect prismatic cleavage. Transparent and colored varieties show strong pleochroism. Strangely, the name spodumene means “ash-colored” in Greek referring to the dull and colorless examples when it was first named in the second half of the 19th century.