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oval cut dolomite from Brazil

dolomite

ck_admin March 24, 2021

Identified by de Saussure in 1792, its name honors the French mineralogist Dolomieu. Very common mineral, especially as gangue in the ore deposits. Not to be confused with dolostone which is a rock composed of dolomite.

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dioptase from Zaire cut in cabochon

dioptase

ck_admin March 24, 2021

It has long been confused with emerald with whom shares the same color, but it was identified in 1801 as a specific species by René Just Haüy. Its name comes from the Greek, recalls that its cleavage planes are visible through the crystal, which was

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diaspore from Turkey

diaspore

ck_admin March 24, 2021

Discovered in 1801 in the Urals in Russia, its name comes from the Greek word “diaspora”, meaning “disperse” because when heated with a blowtorch it explodes and disperses into small particles. It is a component of earthy bauxite, but is found in gem quality in

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“ De Beers Centenary “ diamond

diamond

ck_admin March 24, 2021

This gem, the best known and most prestigious, is named after its hardness, “adamant” in Greek, which means unconquerable because there are no known naturally occurring minerals that are harder than it. Pure and white, it has an incomparable brilliance, and it sparkles in all

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oval cut kyanite from Nepal

kyanite

ck_admin March 24, 2021

Its name recalls its dominant color : blue in Greek (cyan). Sometimes colorless, but generally blue to bluish green, this gemstone has a hardness ranging, with its texture in plans, from 4.5 (direction of elongation) at 6 to 7 (perpendicular to the elongation). It also

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crocoite crystals from Tasmania Australia

crocoite

ck_admin March 24, 2021

It is named after the “crocus” as the color of its powder is saffron (which comes from this plant). It was discovered in 1766 in Berezov in the Urals (Russia). It was then called “Siberian red lead”, then it was named crocoïse by Beudant and

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