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. … The use of these types of heat treatment is usually not specified.
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 gems less valuable?
Heat treatment is the most common treatment and without heat treatment the availability of fine gems would be significantly less. With less gems prices would be dramatically higher only available to the rich. This is the reason untreated gems often command 30% to 50% higher prices.
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.
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.
What is unheated Emerald?
There is nothing known as an unheated Emerald and Emerald does not go through heat treatment. It is easy for a business minded entity to harvest some keywords and drive traffic to the site.
What does unheated sapphire mean?
Unheated sapphires mean the sapphire is natural and it has not been enhanced by any form of heat treatment or any other treatment.
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 do fake rubies look like?
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. … A real ruby should be more like a bright traffic light, however, than like a dull stone.
What is a filled ruby?
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.
How do you test if a ruby is real?
Since many artificial rubies use glass or glass combinations, use the glass-to-glass comparison test to check authenticity. All you need is a piece of glass that’s a similar color and hue. If the two have the same color, you have a fake ruby. Rubies will never be the same color as regular glass.
Why are rubies glass filled?
Silica glass has been used extensively to fill cavities and fractures in rubies since the 1980s. Cavity filling was noted first, and it was described as early as 1984 (Kane, 1984). This filling did improve the stones’ face-up appearance and could add weight, but it could also readily be detected with magnification.
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.