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Gemstones, Minerals & Fossils
Lapidary
Faceting Rough - How to evaluate a stone for cutting
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<blockquote data-quote="Mr Magoo" data-source="post: 174366" data-attributes="member: 3008"><p>And if you're still not satisfied there are immersion fluids. They have a high RI (refractive index). Water is about 1.34. Chose one close to the RI of the stone you want to check out. The closer the RI the more the stone will disappear revealing hidden flaws. Here are images of immersion fluid with amethyst (RI 1.54) and Topaz (RI 1.62). The fluid is 'Refractol' RI 1.57</p><p></p><p>The top image is a Topaz sold as 'flawless'. Looks Ok. In the second image we see the true story. The third image shows two Topaz and two Amethyst.</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/3008/1438487158_top1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/3008/1438487201_topaz.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/3008/1438487230_ame_top.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Mr Magoo, post: 174366, member: 3008"] And if you're still not satisfied there are immersion fluids. They have a high RI (refractive index). Water is about 1.34. Chose one close to the RI of the stone you want to check out. The closer the RI the more the stone will disappear revealing hidden flaws. Here are images of immersion fluid with amethyst (RI 1.54) and Topaz (RI 1.62). The fluid is 'Refractol' RI 1.57 The top image is a Topaz sold as 'flawless'. Looks Ok. In the second image we see the true story. The third image shows two Topaz and two Amethyst. [img]https://www.prospectingaustralia.com/forum/img/member-images/3008/1438487158_top1.jpg[/img] [img]https://www.prospectingaustralia.com/forum/img/member-images/3008/1438487201_topaz.jpg[/img] [img]https://www.prospectingaustralia.com/forum/img/member-images/3008/1438487230_ame_top.jpg[/img] [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Faceting Rough - How to evaluate a stone for cutting
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