2.95 Carat Fiery Red Ruby - Gorgeous

Item Information

Dimensions (mm) 8.9 x 7.1 x 4.7mm
Weight (carats) 2.95 carats
Colors
Filled Cavities or Fissure/Cobalt

Jewelry ready beauty.

Fiery composite Ruby.

Glass clarity enhanced for

superior appearance.

Vibrant color.

Impressive Gem to hold in hand.

Owner will love this Gem.

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Description of Treatment:

Exerpt from Wikopedia: https://en.wikipedia.org/wiki/Ruby 

Another treatment, which has become more frequent in recent years, is lead glass filling. Filling the fractures inside the ruby with lead glass (or a similar material) dramatically improves the transparency of the stone, making previously unsuitable rubies fit for applications in jewelry.[19] 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 and dramatically improves the overall transparency of the ruby.[20]

If a color needs to be added, the glass powder can be "enhanced" with copper or other metal oxides as well as elements such as sodium, calcium, potassium etc.

The second heating process can be repeated three to four times, even applying different mixtures.[21] When jewelry containing rubies is heated (for repairs) it should not be coated with boracic acid or any other substance, as this can etch the surface; it does not have to be "protected" like a diamond.

The treatment can identified by noting bubbles in cavities and fractures using a 10× loupe.[22]

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       The article gives an excellent description of the treatment process.   

       All Rubies have pores and microscopic fissures, with treated Rubies, these are cleaned and filled with glass.

       Glass treatment produces cleaner appearance, fewer inclusions, better fire and color.

       The durability of these stones has been outstanding.          

       This Ruby is guaranteed against breakage for one year (not to exceed the purchase price).

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On a very, very infrequent basis, stones of many species are treated. All stones are

examined under 30 power magnification for any trace of these treatments. Stones that

show treatment are clearly stated.

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beauty and are suitable for elegant jewelry applications where the fabricator wants

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$191.00 USD

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Pricing & Details

Auction ID 1192058
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Viewed 248 times
Starts 3rd May 2020 10:52am PDT

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