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What is a fracture filled Ruby?
Ruby fractures are filled with a transparent lead glass as the refractive index of corundum and lead glass are very similar which allows light to travel through the stone, improving the colour and clarity. Madagascan rubies disfigured by fissures or surface cracks are often "repaired" using heat treatment with lead glass. They can be found in large sizes at a fraction of the cost of untreated stones. These rubies represent an excellent value in the market if the treatment is disclosed and the price is appropriate.
Red Sox’s World Series rings are gem-laden
Mozambican Ruby Auction in Singapore Generates $33.5 million
Gemfields’ inaugural auction of rough rubies and corundum from its 75 percent-owned Montepuez ruby deposit was held in Singapore from June 12-17. It reported to yield gross auction revenues of $33.5 million and an overall average value of $18.43 per carat. 57 out of the total 62 lots of high and low quality rough rubies and corundum were sold, representing approximately 91-percent of the lots offered. The proceeds will be fully repatriated to Montepuez Ruby Mining Limitada.
“Adding the revenues from our maiden ruby auction to those derived during this financial year from rough emerald and beryl sales implies aggregate consolidated revenues (from rough gemstone sales) in excess of $143 million,” said Ian Harebottle, CEO of Gemfields.