Heat treatment is used to either develop or intensify a ruby’s natural color. Heat treatment can also improve the clarity of a ruby by removing or reducing inclusions and making them less visible. The way this works is quite technical.
Are heat-treated rubies worth anything?
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 heat-treated rubies bad?
It is good to note that the Gemological Institute America and other certification authorities ACCEPT that heat treatment is perfectly normal for enhancing a natural ruby and indeed that the process is permanent and will not degrade over time.
What does heat treatment do to a ruby?
Heat Treated Ruby
The atmosphere around the Ruby can be altered to change the way the Ruby reacts but the basic idea is that the heat will dissolve any rutile inclusions inside the stone which will improve the clarity and improve the red colour.
How can you tell if a ruby is heat-treated?
It often leaves behind some types of traces due to the high-melting point. Traces of silk are usually easy to spot due to their specific orientation. If a ruby has been heat-treated, it is also possible for it to have been heated in the presence of flux to help heal severe fractures.
How much is a 1 carat ruby worth?
Ruby – Single Stone Price List
|Size||V. Fine||Finer Grade|
|under 1 ct.||call||$500-850|
|1 carat size||call||$700-1500|
|2 carat size||call||$1000-2500|
|3 carat size||call||$1500-2500|
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.