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.
What does heat treating do to ruby?
Heat Treated Ruby
It is used to improve the clarity and colour of Rubies. … 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.
Should rubies be heat treated?
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 real?
The Heating Process
They are totally natural but only account for a small percentage of gemstones sold, they are usually the larger stones being a carat or two plus. In the late 19th century imitation of rubies and sapphires were just coloured glass and easy to tell apart from the real thing.
Are heated rubies worthless?
These gemstones are still natural and they do not require special care. Such treatment is permanent and does not degrade over time. It would be wrong to claim that heating necessarily diminishes ruby’s value: an excellent quality heated ruby can easily cost more than an untreated ruby of inferior quality.
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.
What is a treated ruby ring?
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 is unheated ruby?
Unheated Ruby is classified as Natural Ruby that has not been heat treated. … The characteristics of the inclusions in unheated ruby are intact silk needle-like intersecting at 60 degrees angle. Other following properties of inclusions are unaltered calcite and prismatic like crystals.
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.
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|
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 does unheated mean for gemstones?
Unheated sapphires and untreated sapphires are one and the same as no treatment can be applied to a sapphire without the help of heat treatment. Unheated sapphires mean the sapphire is natural and it has not been enhanced by any form of heat treatment or any other treatment.
How can you tell a real ruby?
Use the ruby to scratch a hard, smooth surface, such as a piece of glass. If there is a streak of red color left behind on the surface, then it is clear that your stone is a fake. A real ruby will never leave color in that way.
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.
Do real rubies have bubbles in them?
The most notorious visual characteristic of a composite ruby is the internal gas bubbles (Figures 1 & 2). These can be single spheres or clouds of bubbles, flattened or rounded, and they are present in virtually all lead glass-filled rubies. On most occasions, they are visible even to an unaided eye.
What does Filled ruby mean?
At face value, the process to create a lead glass filled ruby seems the same. They use heat and a substance to alter color and fill the fractures that exist in the stone. This creates a more transparent, eye clean, brighter gem that resembles a more expensive ruby.