2M+ REVIEWS | 1000+ NEW GEMS DAILY |

You have not bid on this auction.

$71.00
Current Bid
1
Bids
Closed
10/07/2023 07:09 pm
1
2264
13

7.70 CTS ALEXANDRITE - SPECIMEN FROM TANZANIA [STS2262]

SKU
Dimensions (mm)
14.000 x 12.000 x 6.000mm
Weight (cts)
7.700
Type
Specimen
Colours

ALEXANDRITE SPECIMEN

 

This is a natural untreated Alexandrite specimen  from Tanzania which i bought from the miner on my last trip there. They are not suitable for faceting but can be cabbed or kept as a specimen.

 


The most sensational feature about this stone, however, is its surprising ability to change its colour. Green or bluish-green in daylight, alexandrite turns a soft shade of red, purplish-red or raspberry red in incandescent light. This unique optical characteristic makes it one of the most valuable gemstones of all, especially in fine qualities.

 

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.

 

Like many other gemstones, alexandrite emerged millions of years ago in a metamorphic environment. But unlike many others, its formation required specific geological conditions. The chemical elements beryllium (a major constituent in chrysoberyl) and chromium (the colouring agent in alexandrite) have contrasting chemical characteristics and do not as a rule occur together, usually being found in contrasting rock types. Not only has Nature brought these contrasting rock types into contact with each other, but a lack of the chemical element silica (the second most common element in the Earth's crust) is also required to prevent the growth of emerald. This geological scenario has occurred only rarely in the Earth's history and, as a result, alexandrite crystals are very scarce indeed.

Shipping provider Shipping to Australia Shipping to rest of world
FedEx $12.00 / 3 days $39.00 / 10 days
Australia
FedEx is discounted to $12.00 on orders with 2 or more items
Rest of the world
FedEx is discounted to $39.00 on orders with 2 or more items
Registered Shipping $9.00 / 7 days $16.00 / 21 days
Australia
Registered Shipping is discounted to $9.00 on orders with 2 or more items
Rest of the world
Registered Shipping is discounted to $16.00 on orders with 2 or more items

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
Verified
18575 Feedback

Bids History (1)
axeman44
Purchased from this seller previously
8 months ago
$70.00

Why are users outbidding themselves?

When a bid is placed, this is the maximum amount a user is willing to bid for the product. Our system will then automatically bid on that users behalf, incrementally increasing the bid to maintain their position as the highest bidder, up to the specified maximum.

When there is an icon indicating 'Auto Bid,' it means our system is actively placing bids for the user based on their maximum bid. This may appear as if users are outbidding themselves, but it's simply a result of the system updating the bid to reflect the users maximum limit.

Audit

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

Comments

The Verified Seller responsible for this item has diligently provided us with accurate and comprehensive information, encompassing crucial details such as weight, dimensions, and treatment. It is important to reiterate our commitment to upholding the highest standards of integrity and transparency in the gemstone industry. As part of our policy, we strictly permit the sale of exclusively natural gemstones that have been sourced directly from the Earth. However, in the event that a gemstone has undergone any form of treatment, it is mandatory for the seller to provide full disclosure regarding the treatment process. Furthermore, we would like to emphasize that man-made gemstones, including simulants and imitations, are strictly prohibited on our platform. We prioritize the promotion of authentic, natural gemstones to ensure a genuine and trustworthy marketplace for our valued customers. Should you have any further inquiries or require additional assistance, please do not hesitate to reach out. We are here to assist you and provide a seamless experience on Gem Rock Auctions.

This audit was requested 8 months ago
Last updated 8 months ago

Shipping Details

Shipping:
$16.00 21 days via Registered Shipping
Ships from:
Australia

Payment Options

  • paypal
  • stripe
This seller adds 10.00% tax to transactions in Australia.

Overview

Listing Type : Standard
Product ID : 1487240
Estimated RRP : $260.00
Starting Bid : $70
Starts : 27th June 2023 02:55 pm AEST
Ends : 11th July 2023 12:09 pm AEST
* All prices are in USD