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$150.00
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25/09/2022 09:48 pm
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TANZANITE ROUGH SPECIMEN 5.5 CTS [S3718 ]

SKU
Dimensions (mm)
x x mm
Weight (cts)
Type
Rough
Colours

 

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MEMBER OF iNTERNATIONAL COLOURED ASSOCIATION COMMITED TO FULL DISCLOSURE OF STONES WITH A MONEY BACK GUARANTEE.

TANZANITE CRYSTAL SPECIMEN.

This is a  natural crystal specimen from Merelani in Tanzania.

Weight 5.5 cts app

size 15.7x 8.7x7.1mm app

Tanzanite is an extraordinary gemstone. It occurs in only one place worldwide -Tanzair africa. Its blue, surrounded by a fine hint of purple, is a wonderful colour. Thanks to its unusual aura and the help of the New York jeweller's Tiffany, it has rapidly become one of the most coveted gemstones in the world.

Tanzanite is a blue variety of the gemstone zoisite. It consists of calcium aluminium silicate and is not particularly hard, having a value of 6.5 to 7 on the Mohs scale. For that reason, it should always be worn carefully and never placed in an ultrasonic bath for cleaning or brought into contact with acids.

The deep blue of the tanzanite is fantastic, and runs from ultramarine blue to light violet-blue. The most coveted colour is a blue surrounded by a delicate hint of purple, which has a particularly wonderful effect in sizes of over 10 carats. The well developed polychromaticity of the tanzanite is typical: depending on the angle from which you look at it, the stone may appear blue, purple or brownish-yellow. Having said that, most raw crystals are somewhat spoiled by a brownish-yellow component, though it can be made to disappear by the cutter if he heats the stone carefully in an oven to approximately 500°. During the procedure he must pay careful attention to the moment at which the colour turns to blue. This burning is a method of treatment which is regarded as customary in the trade, but the raw stones must be as free of inclusions as possible, since otherwise fissures may occur. In fact working with tanzanite can sometimes give even the most experienced cutter a bit of a headache, the cleavage of this gemstone being very pronounced in one direction. This exclusive gemstone is cut in every imaginable shape from the classical round shape to a number of imaginative designer cuts.

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sedagems
sedagems
MEMBER OF THE  [ICA] INTERNATIONAL COLOURED STONE ASSOCAITION AND PRESIDENT OF THE OPAL ASSOCIATION. PAUL SEDAWIE IS A FORMER OPAL MINER WHO NOW TRAVELS AROUND AUSTRALIA AND THE WORLD COLLECTION RARE AND INTERESTING GEMS TONES AND FOSSILS.ALL STOCK HAS A MONEY BACK GUARANTEE We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
Mermaid Waters, Australia
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Bids History (1)
chico130013
Purchased from this seller previously
1 year ago
$149.00

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This product has been audited by a Gemstone Sheriff and they have found the following:
  • Description Accurate
  • Pictures Accurate

Comments

The Verified Seller has provided accurate and complete information for this item including weight, dimensions, and treatment.

This audit was requested 2 years ago
Last updated 2 years ago

Shipping Details

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$16.00 21 days via Registered Shipping
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Australia

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Overview

Listing Type : Standard
Product ID : 80749
Starting Bid : $149
Starts : 16th September 2022 06:00 pm AEST
Ends : 26th September 2022 02:48 pm AEST
* All prices are in USD