Item Information

Dimensions (mm) 6 x 8 x 381mm
Weight (carats) 350 carats
Filled Cavities or Fissure/Cobalt

This is a very nice pair of natural ruby from the mines of Madagascar….6x8mm and weight 3,50cts…Eye clean…Blood red color…Heat and filled…

For explanation of filled ruby Small cracks or fractures in a gemstone can interrupt the flow of light through the stone, creating white or “dead” spots in the color of the stone. Sometimes these fractures–if they reach the surface of the stone–will be filled with material that will allow the light to pass through smoothly. 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.

4d 15h 59m 45s

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Pricing & Details

Bid Increment $1.00
Starting Bid $99.00
Auction ID 266098
Watchers 18 watching
Viewed 1,878 times
Starts 14th Sep 2017 4:02am PDT
Ends 24th Sep 2017 4:00am PDT

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