July 11-12:BILLINGS, MONTANA: Annual show; Billings Gem and Mineral Club; Sat. 10-5, Sun. 10-4; Free admission!
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 Post subject: 5.94ct Chrome Tourmaline GORGEOUS!
PostPosted: Mon Jun 02, 2008 5:27 pm 
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Ok. SO it's a friggin heart shape. But look at the tone! and the Crystal! WOW! Not a bad price methinks.

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PostPosted: Mon Jun 02, 2008 6:27 pm 
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What is that picture of a red gem doing in the middle of the ad? ??? I don't get it.


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PostPosted: Mon Jun 02, 2008 6:58 pm 
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Because Chrome Tourmaline contains Chromium, it appears red when viewed through a Chelsa filter...hence the red pic.

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PostPosted: Tue Jun 03, 2008 7:01 am 
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Thanks!


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PostPosted: Thu Jun 12, 2008 1:53 am 
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uhhm, VVS Chrome Tourmaline of that size. Might be lab grown. Tourmaline is known to have inclusions and they are acceptable, so how can there be so many of these big, clean ones on ebay? My first instinct would be, lab grown.

But maybe this one is not. If you purchase it, I hope it is the real deal.

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PostPosted: Thu Jun 12, 2008 5:23 am 
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tightropewalker wrote:
uhhm, VVS Chrome Tourmaline of that size. Might be lab grown.


Wait a minute... synthetic tourmaline? Where?


6cts doesn't sound that huge. Whether that stone is what it is claimed, any one's guess.


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PostPosted: Thu Jun 12, 2008 12:50 pm 
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We know synthetic tourmaline can be manufactured, but I was not aware of anyone doing it in the appropriate "species", gem-grade quality, and realistic quantity...


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PostPosted: Thu Jun 12, 2008 12:56 pm 
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"Doublets and triplets composed of various gems or gem-and-glass combinations can imitate Paraíba tourmaline. Magnification with or without immersion easily reveals such assembled stones. While hydrothermal synthetic tourmaline has been grown on an experimental basis, it has not yet been seen in the gem market because of poor quality and high production costs. Flame-fusion synthetic spinel is sometimes incorrectly marketed as “synthetic tourmaline,” but is easily distinguished by its higher RI and singly refractive nature." (bold added)

From GIA Insider, March 25, 2005 "Insider Gemologist: What Are the Identifying Characteristics of Green Tourmaline?"


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PostPosted: Thu Jun 12, 2008 12:59 pm 
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Wow, while I was looking at that, I also saw (from the same issue) that it's possible to "manufacture" gold (or silver) in quartz... some of it so good that you need a chemical test on the metal to determine whether or not it's natural. :(


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PostPosted: Thu Jun 12, 2008 3:00 pm 
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I know the guys that developed that process and I have a slab of gold in quartz and a slab of silver in quartz.. wow thx gem-noob for reminding me.. .w/ the price of gold almost 4x what it was when I bought that, I think I'll go buy a car!

:)

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PostPosted: Fri Jun 13, 2008 1:09 am 
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gem-n00b wrote:
...tourmaline has been grown on an experimental basis, it has not yet been seen in the gem market because of poor quality and high production costs...


Ya, remember that. The information is older then 2005, but don't think the situation has changed. Why I keep believing that: because even when it came to producing a synthetic in 'Paraiba' color - no one came up with tourmaline (but beryl, by Morion). Maybe next time :roll: ...


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