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$47.00
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21/06/2020 03:09 am
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81.15 CTS RUBY ROUGH FROM MADAGASCAR -TREATED [F7359]

SKU
Dimensions (mm)
19.000 x 15.000 x 8.000mm
Weight (cts)
81.150
Type
Rough
Colours

IMPORTANT NOTE: This item contains fissure filled cavities that may contain glass, cobalt, or other materials. Due to the presence of these materials, this item should be referred to as a composite stone.

 

 

RUBY ROUGH

 

 

Birthstone for  July

 

This is a natural rough Ruby which has been  treated  and  showing stunning colours of red with a purple tinge.This specimen can be cut into a large stone or it is ideal as a carving piece. We have placed the rough under a bright torch to do the photos.The rough is more opaque than transparent.

This is a piece of rough mined in Madagascar-africa.The material has been heated to improve its colour and it has also been treated by lead glass filling

 

Mohs scale 9

 

 

A Ruby is a pink to blood-red gemstone  a variety of the mineral corundum (aluminium oxide]. The common red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. Prices of rubies are primarily determined by color. The brightest and best “red” called pigeon blood-red, commands a huge premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions will indicate that the stone has been treated one way or another. Cut and carat (size) also determine the price

 

TREATMENTS

 

The most common treatment is the application of heat. Most if not all rubies at the lower end of the market are heat treated on the rough stones to improve color, remove purple tinge, blue patches and silk. These heat treatments typically occur around temperatures of 1800°C (3300°F).Some rubies undergo a process of low tube heat, when the stone is heated over charcoal of a temperature of about 1300°C (2400°F) for 20 to 30 minutes. The silk is only partially broken as the color is improved.

LEAD GLASS TREATMENT 

Filling the fractures inside the ruby with lead glass dramatically improves the transparency of the stone, making previously unsuitable rubies fit for applications in jewelry. The process is done in four steps:

  1. The rough stones are pre-polished to eradicate all surface impurities that may affect the process
  2. The rough is cleaned with hydrogen fluoride
  3. The first heating process during which no fillers are added. The heating process eradicates impurities inside the fractures. Although this can be done at temperatures up to 1400°C (2500°F) it most likely occurs at a temperature of around 900°C (1600°F) since the rutile silk is still intact
  4. The second heating process in an electrical oven with different chemical additives. Different solutions and mixes have shown to be successful, however mostly lead-containing glass-powder is used at present. The ruby is dipped into oils, then covered with powder, embedded on a tile and placed in the oven where it is heated at around 900°C (1600°F) for one hour in an oxidizing atmosphere. The orange colored powder transforms upon heating into a transparent to yellow-colored paste, which fills all fractures. After cooling the color of the paste is fully transparent, that dramatically improves the overall transparency of the ruby.

 

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

quality rough
quality rough
The owner Paul Sedawie is the current president of the Opal Association.All my life i have enjoyed collecting minerals and fossils .I have been opal mining and now have a large opalized fossil collection of museum quality.I enjoy visiting mines in different parts of the world and try to buy direct off the miner or as close to the source as possible to give you the best deals.Natural stones/minerals fascinate me so I don�t stock laboratory made stones.I have a few sites here which I head under the Seda group.I believe that your continued business is my business so I hope you enjoy the amazing array and beauty of nature I have to offer.Best Regards Paul Sedawie 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
Lightning Ridge, Australia
Verified
8623 Feedback

  • deleted_239796
    deleted_239796
    Positive

    Good quality, fast shipping, gemstones accurate as advertised and great service as provided a couple of bonus items

  • tr3y003
    tr3y003
    Positive

    A+ seller great looking piece

  • kylea
    kylea
    Positive

    Paid and shipped - no feedback left after 100 days

  • chris47
    chris47
    Positive

    The stone is very beautiful. Im really looking forward to cut it. Its always a pleasure to make business with you

  • chris47
    chris47
    Positive

    The stone is very beautiful. Its always a pleasure to make business with you

  • chris47
    chris47
    Positive

    The stones are very beautiful. Im really looking forward to cut them. Its always a pleasure to make business with you

Bids History (1)
deleted_239796
Purchased from this seller previously
3 years ago
$46.00

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Shipping Details

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

Payment Options

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This seller adds 10.00% tax to transactions in Australia.

Overview

Listing Type : Standard
Product ID : 730610
Starting Bid : $46
Starts : 21st June 2020 12:45 pm AEST
Ends : 21st June 2020 08:09 pm AEST
* All prices are in USD