Why do we heat rubies?

Are heated rubies less valuable?

You should assume your ruby is heated. Rubies that have a report from an independent laboratory like GIA confirming there is no evidence of heat command a premium due to their rarity. Rubies that have been diffused or are glass filled are worth less than heated rubies.

Are heated rubies bad?

The heating process is in fact just a way of artificially enhancing the colour of a gemstone. It does no harm but to say a gemstone has been unheated when it has been is not being truthful. A stone that has no heat treatment can be tested and certified by a GemLab.

What can break a ruby?

Rubies are extremely hard and rank almost at the top of the toughness scale. They’re intensely resistant to scratches and cleavage and are near-impossible to break. Even if the ruby is cracked, it can still withstand further damage. Although, a bad enough crack can eventually break the stone.

What is unheated ruby?

Unheated Ruby is classified as Natural Ruby that has not been heat treated. These natural rubies are known to be quite easy to identify as compared to the unheated rubies, as it has natural inclusions that are 10 times visible when seen using a microscope.

What does it mean when a ruby is glass filled?

He went on to explain that lead-glass rubies are not found naturally in the earth, but are instead made using a combination of low-quality corundum, the mineral found in ruby, which is then infused with high amounts of lead glass. The mixture is heated at high temperatures and then cooled, cut and polished.

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