ALEXANDRITE ROUGH PARCEL TANZANIA COLOURCHANGE 19.30 CTS TBM-590

Item Information

Dimensions (mm) 14 x 7 x 7mm
Weight (carats) 19.3 carats
Colors

ALEXANDERITE PARCEL (3 PCS)

BI-COLOUR

TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

NICE GREEN CHANGES TO PURPLE

IDEAL FOR CABBING

TREATMENT-NONE

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.

$300.00 USD

Add to Cart Make an Offer
Shipping $7.00
21 Days via Standard Shipping
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

Auction ID 528495
Watchers 3 watching
Viewed 1,831 times
Starts 6th Sep 2015 6:17pm PDT

Shipping & Insurance

Provider Shipping Transit
DHL $25.00 4 Days
Express Shipping $30.00 7 Days
FedEx $30.00 5 Days
Registered Shipping $30.00 21 Days
Standard Shipping $7.00 21 Days
Shipping Insurance all providers $21.00 (optional)