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Whewellite is correct! 1bwana1 wins a GT Pro download!

Well, that didn't take long! Must have been too easy.

I get this question a lot. And the answer is Yes, it still works great. The only thing that doesn't work is the Help system. You can download a free patch from Microsoft but you really don't need the Help system. GT Pro is that easy.

Haven't done this in ages. The first person to ID this gemstone will win a free download of Gemology Tools Professional.
Clues:
1) Transparent
2) Colorless
3) High RI: 1.65
4) Low RI: 1.49
5) SG: 2.20

jleb, I don't understand your question. I guess you mean the Tsavorite is too included to facet. Wouldn't you just price it out like you would any other piece of rough that is cut en cabochon?

I've had many people ask when there was going to be a Mac version of Gemology Tools Professional. Well, that is not going to happen. But I have tested GT Pro on a laptop that is running Linux. If you load WINE onto a Mac it should run GT Pro. In my tests on my Linux laptop I loaded WINE and ran GT ...

How about sending your specimen to the esteemed Carbonado researcher Professor Stephen Haggerty of Florida International University? He might be very interested and very helpful. At least send him your photos.

Well Barbra, I wanted to pick something that wasn't on anyone's radar. Oddly enough marcm is a repeat winner. He won in 2010 as well!

Ding, ding, ding! We have a winner. marcm's guess of Bustamite is the correct answer. marcm pm me with your email address so I can send you a link to download Gemology Tools Professional. Congrats.

Good night. Will continue tomorrow if we can find anyone interested.

No, not Thulite. Clue #4: High RI: 1.70

Stephen, you are the only one playing so you'll probably be shoo-in to win. Are you a GT Pro user?

Rhodochrosite is a good guess. But, no.

Clue #3: Using Dr. Hanneman's Specific Gravity tester we get an SG of about 3.4

Nice tries. Sorry, I was off napping. Taking pain meds so I probably shouldn't even be doing this. Hope I don't mess it up.

Clue #2: On the polariscope we have determined that the gem is doubly refractive.

Well, a half hour has come and gone with no replies so I guess I'll wait until someone makes a guess before posting the 2nd clue.