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01/10/2011 04:50 am
PARCEL OF 25 NATURAL RUBY...171 cts
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Description
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.
The process of fracture filling ruby with transparent lead glass is a recent innovation that began about 2004 in Chanthaburi, Thailand. Rubies of good color, primarily from Madagascar, that are disfigured by fissures or surface cracks can be "repaired" using heat treatment with lead glass. The refractive index of corundum and lead glass are very similar, allowing light to travel through the stone, improving the color and clarity. These rubies are often found in large sizes at a fraction of the cost of untreated ruby of similar color. So they represent an excellent value in the market, so long as the treatment is disclosed and the price is appropriate. The Asian Institute of Gemology tested fractured filled rubies for durability and found them to be more durable than a typical emerald fracture-filled with oil or resin. AIGS advised against excessive heating with a jeweler's torch, but found no negative effects from cleaning with detergents or ultrasonic devices. They advise that hydrofluoric acid should not be used on these gems, and that any recutting or repolishing should be performed with care.(article by courtesy of Gemselect from chanthaburi,Thailand)
This is a big parcel of 25 natural ruby from the mines of ORISSA, India...171 cts and sizes between 21X15mm and 7X9mm...clarity opaque...Heat/filled.......For explanation of filled ruby
The process of fracture filling ruby with transparent lead glass is a recent innovation that began about 2004 in Chanthaburi, Thailand. Rubies of good color, primarily from Madagascar, that are disfigured by fissures or surface cracks can be "repaired" using heat treatment with lead glass. The refractive index of corundum and lead glass are very similar, allowing light to travel through the stone, improving the color and clarity. These rubies are often found in large sizes at a fraction of the cost of untreated ruby of similar color. So they represent an excellent value in the market, so long as the treatment is disclosed and the price is appropriate. The Asian Institute of Gemology tested fractured filled rubies for durability and found them to be more durable than a typical emerald fracture-filled with oil or resin. AIGS advised against excessive heating with a jeweler's torch, but found no negative effects from cleaning with detergents or ultrasonic devices. They advise that hydrofluoric acid should not be used on these gems, and that any recutting or repolishing should be performed with care.(article by courtesy of Gemselect from chanthaburi,Thailand)
Shipping
| Shipping provider | Shipping to France | Shipping to rest of world | Combined Shipping (France) | Combined Shipping (rest of the world) |
|---|---|---|---|---|
| Standard Shipping - Tracked |
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| Registered Shipping |
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Details
- SKU
- Dimensions (mm)
- x x mm
- Weight (cts)
- Certified Gemstones
- No
- Colours
-
Description
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.
The process of fracture filling ruby with transparent lead glass is a recent innovation that began about 2004 in Chanthaburi, Thailand. Rubies of good color, primarily from Madagascar, that are disfigured by fissures or surface cracks can be "repaired" using heat treatment with lead glass. The refractive index of corundum and lead glass are very similar, allowing light to travel through the stone, improving the color and clarity. These rubies are often found in large sizes at a fraction of the cost of untreated ruby of similar color. So they represent an excellent value in the market, so long as the treatment is disclosed and the price is appropriate. The Asian Institute of Gemology tested fractured filled rubies for durability and found them to be more durable than a typical emerald fracture-filled with oil or resin. AIGS advised against excessive heating with a jeweler's torch, but found no negative effects from cleaning with detergents or ultrasonic devices. They advise that hydrofluoric acid should not be used on these gems, and that any recutting or repolishing should be performed with care.(article by courtesy of Gemselect from chanthaburi,Thailand)
This is a big parcel of 25 natural ruby from the mines of ORISSA, India...171 cts and sizes between 21X15mm and 7X9mm...clarity opaque...Heat/filled.......For explanation of filled ruby
The process of fracture filling ruby with transparent lead glass is a recent innovation that began about 2004 in Chanthaburi, Thailand. Rubies of good color, primarily from Madagascar, that are disfigured by fissures or surface cracks can be "repaired" using heat treatment with lead glass. The refractive index of corundum and lead glass are very similar, allowing light to travel through the stone, improving the color and clarity. These rubies are often found in large sizes at a fraction of the cost of untreated ruby of similar color. So they represent an excellent value in the market, so long as the treatment is disclosed and the price is appropriate. The Asian Institute of Gemology tested fractured filled rubies for durability and found them to be more durable than a typical emerald fracture-filled with oil or resin. AIGS advised against excessive heating with a jeweler's torch, but found no negative effects from cleaning with detergents or ultrasonic devices. They advise that hydrofluoric acid should not be used on these gems, and that any recutting or repolishing should be performed with care.(article by courtesy of Gemselect from chanthaburi,Thailand)
Shipping
| Shipping provider | Shipping to France | Shipping to rest of world | Combined Shipping (France) | Combined Shipping (rest of the world) |
|---|---|---|---|---|
| Standard Shipping - Tracked |
|
|
|
|
| Registered Shipping |
|
|
|
|
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Pays De La Loire, France
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Shipping Details
Costs:
Transit:
21 days via Registered Shipping
Ships from:
France
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Overview
Listing Type :
Standard
Product ID :
226545
Starts : 29th September 2011 05:05 am PDT
* All prices are in USD