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 heated rubies 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.
What is a heated 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.
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 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.
What does it mean when a gemstone is heated?
Heating is used to either lighten, darken or alter the color of a gem. Amethyst is heated to lighten its color. Heat a little more and some sources of amethyst will alter color from deep purple to orange colored citrine. … Upon heating the gem is left with the blue and violet we know as tanzanite.
How can you tell if its 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.
How do you tell if a ruby is heated?
Ways of Detecting “Normal Heat” Treatment Rubies is by Seeing The Following Inclusions:
- Discoid fractures with tension halos. …
- Burned or altered mineral inclusions. …
- Broken silk or partially “reabsorbed” rutile needles.
- Ruptured two-phase inclusions and negative crystals.
- Sintered surface areas, especially around the girdle.
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|
What is pigeon blood ruby?
Pigeon’s blood is the term applied to the most highly saturated colour and natural red fluorescence possible in a ruby. Weighing an impressive 10.05 carats, the Ratnaraj is a wonder of the natural world.
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 Burmese ruby?
The Burmese ruby is one of the most valuable variations of the corundum mineral family. … The Burmese ruby, however, is a piercing bright red, sometimes referred to as “pigeon’s blood”. All rubies owe their coloring to the element chromium and the intensity of that color depends on the amount of chromium exposure.
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.
What are enhanced rubies?
It is a common treatment that enhances the value and the appearance of natural rubies. While undergoing this treatment, the ruby is placed under a high temperature of 1800 degrees. The heat dissolves the rutile inclusions and improve the color, transparency and clarity of the ruby.
What does no heat GEM mean?
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 if a gemstone is dyed?
Another thing you can look is the colors of the gemstone. If you observed that there are areas of the gemstone where the color is extremely concentrated than the other areas of the stone, then it’s likely dyed.