ALEXANDRITE ROUGH TANZANIA COLOUR CHANGE 84.15 CTS AS-A7008

Item Information

Dimensions (mm) not provided
Weight (carats) not provided
Colors
Certified Gemstone

 

 

ALEXANDERITE

BI-COLOUR

TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

 NICE  GREEN CHANGES TO PURPLE

  IDEAL FOR  CABBING

TREATMENT-NONE

WEIGHT:  84.15  CTS APPROX

SIZE: 29 X 26  X 15  APPROX

This rare gemstone is named after the Russian tsar Alexander II (1818-1881), the very first crystals having been discovered in April 1834 in the emerald mines near the River in the Urals. The discovery was made on the day the future tsar came of age. Although alexandrite is a relatively young gemstone, it certainly has a noble history. Since it shows both red and green, the principal colours of old Imperial Russia, it inevitably became the national stone of tsarist Russia.

Alexandrite is very scarce: this is due to its chemical composition. It is basically a chrysoberyl, a mineral consisting of colourless or yellow transparent chrysoberyl, chrysoberyl cat’s eye and colour-changing alexandrite (also in cat’s eye varieties). It differs from other chrysoberyls in that it not only contains iron and titanium, but also chromium as a major impurity. And it is this very element which accounts for the spectacular colour change. Rarely, vanadium may also play a part. According to CIBJO nomenclature, only chrysoberyls displaying a distinct change of colour may be termed alexandrite.

8h 1m 50s

Buy Now $800.00
$
Make an Offer
Shipping $4.00
21 Days via Standard Shipping
0 bids placed so far
Add to Watch List Ask a Question * All prices in USD

Audit Information

The Gemstone Sheriff program allows our members to request an audit on any auction, which is completed by an independent gemologist who assesses the accuracy of the item description and pictures.

Request Audit

Pricing & Details

Bid Increment $1.00
Starting Bid $800.00
Auction ID 287573
Watchers 12 watching
Viewed 2,277 times
Starts 1st Dec 2016 6:02pm PST
Ends 2nd Dec 2016 6:00pm PST

Shipping & Insurance

Provider Shipping Transit
FedEx $4.00 5 Days
Standard Shipping $4.00 21 Days
Shipping Insurance all providers $31.00 (optional)

Hello! Gem Rock Auctions is a global marketplace offering beautiful gemstones from professional gemstone cutters, dealers & miners. Register for $10 off your first purchase.