Emeralds are never heat-treated but are typically treated with oil, wax, or polymer to enhance clarity. This type of treatment is only successful when there are fissures that reach the surface of the emerald allowing for the introduction of the substance. Acceptable clarity enhancements are colorless and do not change the color of the emerald. I assume your emeralds have already been treated since approximately 95% of all emeralds are. You will probably not be able to make your emeralds look better
I have read, never seen in person, that some actually make use of heat although it is mild heating we are talking about, so where should one draw the line when talking about the concept of heat treatments? Warming both stone and liquid seem to be functioning, right (both cleaning and filling)?
Joined: Sun Oct 16, 2005 12:22 pm Posts: 16705 Location: San Francisco
When we refer to "heat" treatment of gems, we are referring to heat that is significant enough to alter the chemical bonds within a mineral, not the relatively minor heat required to melt waxes and polymer fillers.
Joined: Wed Nov 23, 2005 12:47 pm Posts: 2511 Location: Eastern Europe
Never heard of anyone heating emeralds to alter their color, clarity or obtain whatever other improvement of the stones.... Could only imagine that all those bi/tri-phase inclusions and feathers in emeralds would just shatter the stones.
Now, I am aware that other beryls are heated to change their color: aquamarine to make it less greenish, morganite to make it more pink than peach... heliodor to make it more yellow than golden. Clearly, these have different chromatophores etc. but the nerd in me still wants to ask... what could happen to green beryl if anyone would be foolish enough to heat it! Oh well...
'Demantoid', where have you heard of emerald heating? Anything to read about this?
Post subject: yes, you will find heated emeralds in thailand
Posted: Sat Feb 23, 2008 9:22 am
Joined: Sat Feb 23, 2008 8:18 am Posts: 67
the indian gem traders in bangkok call the heated emeralds "byron"
i have seen this material and when i asked the trader what is it she explain to me that this gem is heated emerald, i examined the gems with my loupe and noticed the sign of heat treatment, maybe some of the forum members that live in bangkok can get more information regarding this material and the process of the treatment.
Joined: Fri Feb 24, 2006 1:20 am Posts: 2559 Location: Southern California, U.S.A.
Slight correction, Doos. The Ozzie manufacturer is Biron, not Byron.
Interesting aside. Some years back I thought there might be a business opportunity in cutting Russian hydrothermal emerald synthetics. I contacted a rough supplier and found it was sold in 3 grades. The higher-clarity grades were nearly always available but lower-clarity material that looked more like heavily fractured and included natural emerald was nearly always sold out. I was told Bangkok cutting houses had standing orders for it. Draw your own conclusions.
Joined: Thu Sep 06, 2007 12:43 pm Posts: 15 Location: Tinley Park, IL USA
Aside from the very accurate comments from the forum members here, you should know that you can burn the oil or resin that your emerald was probably treated with. Much of it would probably vacate the stone, but what remains will turn yellow even brown if you really cook it.
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