SGL: Stone Group Labs

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Better refractometer results with the Bright Line technique

Last post by Barbra Voltaire, FGG « Sat Nov 30, 2019 1:16 pm

by Barbra Voltaire, FGG » Sat Nov 30, 2019 1:16 pm

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84100 Views

Last post by Barbra Voltaire, FGG
Sat Nov 30, 2019 1:16 pm
Gem Intel from Stone Group Labs

Last post by Bear Williams- SGL « Mon Jan 18, 2016 10:13 am
Replies: 10
by Barbra Voltaire, FGG » Mon Oct 13, 2014 4:32 pm

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39546 Views

Last post by Bear Williams- SGL
Mon Jan 18, 2016 10:13 am
Identifying Faceted Black Gems

Last post by Bill Hanneman « Fri Nov 21, 2014 3:12 pm
Replies: 10
by Barbra Voltaire, FGG » Tue Oct 14, 2014 12:12 pm

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13304 Views

Last post by Bill Hanneman
Fri Nov 21, 2014 3:12 pm
Garnet Chemistry, featured in the Journal of Gemmology

Last post by Robin Winter « Mon Oct 20, 2014 2:50 pm
Replies: 1
by Barbra Voltaire, FGG » Mon Oct 20, 2014 1:59 pm

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7105 Views

Last post by Robin Winter
Mon Oct 20, 2014 2:50 pm
Smoke Treatment of Welo Opals by Bear and Cara Williams

Last post by Cara Williams « Wed Oct 15, 2014 3:32 pm
Replies: 1
by Barbra Voltaire, FGG » Tue Jul 08, 2014 2:10 pm

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13236 Views

Last post by Cara Williams
Wed Oct 15, 2014 3:32 pm

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