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Rare Zircon

Two Zircons: One of an unusual size, called red but I think the colour is more brownish organge depending on the light. Definetly a big winner! The other is even rarer, a gorgeous blue, somewhat like blue denim. There is no others like it - really devine.

 

Size: red 9x6,5x3,3 mm, Blue 7,2x5,3x3 mm

Clarity: VS, I2

Origin: Tanzania, Kambodja

I lager:  1 of each

 

Price:  USD 18.96/blue; 23.45/red

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Zirkon (not to be confused with zirconia, cubic zirconia, or zirconium*.) is a mineral belonging to the group of nesosilicates. The name derives from the Persian zargun (زرگون), meaning golden-colored, but the natural color of zircon varies between colorless, yellow-golden, red, brown, blue, and green. Colorless specimens that show gem quality are a popular substitute for diamond and are also known as "Matura diamond".

Zircon occurs as a common accessory mineral in igneous rocks (as primary crystallization products), in metamorphic rocks and as detrital grains in sedimentary rocks. Large zircon crystals are rare. Their average size in granite rocks is about 0.1–0.3 mm, but they can also grow to sizes of several centimeters, especially in mafic pegmatites and carbonatites.

In geological settings, the development of pink, red, and purple zircon occurs after hundreds of millions of years, if the crystal has sufficient trace elements to produce color centers. Color in this red or pink series is annealed in geological conditions above the temperature about 350 °C. Australia leads the world in zircon mining, producing 37% of the world total. Zircons from Jack Hills in the Narryer Gneiss Terrane, Yilgarn Craton, Western Australia, have yielded U-Pb ages up to 4.404 billion years, interpreted to be the age of crystallization, making them the oldest minerals so far dated on Earth. Many cut gem-quality zircons originates from Vietnam and Cambodia.

 

* Cubic Zircon (Zirconium), CZ, is a synthetic material used as substitutes for diamonds. It is heavier than a diamond of the same size and not as hard, 8.5 on the Mohs scale compared to 10 for diamond. Due to its low cost and durability, it has since the beginning of production in 1976 was an important competitor of diamond. The only threat to its position is the chemically produced diamond Moissanite,


CLARITY CLASSIFICATION
IF Internally Flawless No Inclusions Visible Even With 10x Magnification.
VVS Very-Very Slightly Included Minute Inclusions Not Visible To Eye.
VSI Very Slight Inclusions Slight Inclusions Visible To Eye.
SI 1-2 Slight Inclusions: Some Inclusions Visible.
I 1-3 Included Many Inclusions Visible. 807163324

 

 

 

 

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Latest update: 22 september 2015