Vanadium and Chromium-Bearing “Color-Change” Pyrope Garnet

[Nathan Renfro]

http://www.gia.edu/gia-news-research/va ... ope-garnet

[Michael P.]

That is beautiful material!
Thanks for sharing.

Do you know what main pavilion and crown angles were used in cutting these?

[Bill Hanneman]

Can you tell me the RI's of those 5 garnets?

[Nathan Renfro]

This material showed a pretty consistent 1.736 RI for all the samples tested. However, the stones tested for the study don't include the large 5 pieces in the lead photo.

There is a red button to download the full paper at the above link.

[Barbra Voltaire, FGG]

When you open Nathan's link above, click on the Download PDF red button to read the full article:

[Nathan Renfro]

That is beautiful material!
Thanks for sharing.

Do you know what main pavilion and crown angles were used in cutting these?

Sorry, I don't know what the main crown and pavilion angles are on those stones.

[Michael P.]

There is a red button to download the full paper at the above link.

Er, Thanks! havn't seen this

The paper does answer my question about cutting angles as well.
35° crown angle, 38.5° pavilion angle.

Thanks for sharing this!

[Bill Hanneman]

This material showed a pretty consistent 1.736 RI for all the samples tested. However, the stones tested for the study don't include the large 5 pieces in the lead photo.

Thanks. Look me up at Tucsun and we can talk.

[MADADIDIERITE]

We can also find this kind of material in Madagascar, nearby Fort Dauphin.