Heat treatment does not alter the makeup of the Stone. About 10 years ago, rubies with a new form of treatment known as “Lead Glass Filling” came on to the market. This treatment involves taking non-gem quality rubies and filling cavities and fractures in them with lead glass which alters the construction of the stone.
What does heat treatment do to a ruby?
Ruby and sapphire of natural or synthetic origin can be heat treated to improve asterism; to remove asterism or silk; to improve, add, or remove color; and even to alter imperfections.
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.
How can you tell if a ruby has been 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.
What is heat treatment of gemstones?
Heat Treatment is a gemstone’s exposure to high temperatures that alters the color and increases the clarity. Specifically, heating is used to lighten, darken or enrich the color. Without heat treated gemstones, fine gems’ availability in the most desirable colors would be scarce.
How much is a 1 carat ruby worth?
Ruby – Single Stone Price List
|Size||V. Fine||Mid. Range|
|under 1 ct.||call||$300-450|
|1 carat size||call||$450-650|
|2 carat size||call||$600-800|
|3 carat size||call||$600-800|
How do you enhance a ruby?
Clarity Enhancing Treatments
- Heated Rubies: The most commonly used treatment is heat. …
- Flux Healed Rubies: Often times, rubies are coated in a material prior to heating. …
- Beryllium Diffused Rubies: In this treatment, beryllium is added to the ruby as it is being heated.
How can you tell a quality ruby?
Real rubies glow with a deep, vivid, almost “stoplight” red. Fake gems are often dull: they are “light, but not bright.” If the gem is more of a dark red, then it may be garnet instead of a ruby. If it is a real ruby, however, know that darker stones are usually worth more than lighter stones.
What is a 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 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.
Are heated 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.
Are all rubies treated?
Almost all rubies (95%) of rubies today are heat-treated. There are different types and level of heat treatment in rubies. That can be classified from very slight to quite extreme. Distinguishing these levels of treatment can also affect the price of ruby dramatically.
How can you tell if a ruby is natural or synthetic?
Chemical traces are left in the stone of a lab-created ruby and this is not seen in natural rubies. Minimal internal flaws, higher quality at a lower price and a larger ruby for the same price as a smaller one will tell you that it is synthetic.
How do you heat a ruby?
The Ruby is placed in a crucible and heated to extreme temperatures of around 1800 degrees. 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 do you tell if a stone has been heat treated?
The destruction of gas or fluid inclusions or the dissolving of mineral inclusions are clues to heat treatment. For gems that contain rutile needles, the needle margins may become diffuse. On rubies, inclusions may be found that are glassy in appearance.
Are heated gemstones bad?
Durability: Since most gem crystals were formed under high temperatures, when it comes to wearability and durability heating usually does not have a negative effect on a gemstone. Also, the color stability (resistance to fading or color changing) of heated gems is usually very good and they are super stable.