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Gemstones, Minerals & Fossils
Lapidary
FACET DESIGNS
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<blockquote data-quote="Dughug" data-source="post: 132213" data-attributes="member: 157"><p>Gordon,</p><p></p><p>a simple way to adjust the angles is to look at the difference in Crown angle & Pavilion angle for the different materials.</p><p></p><p>In the case of the design you want to work on Quartz @ RI 1.64 has a suggested Crown angle of 41 & Pavilion angle of 42 </p><p></p><p> Corundum RI 1.76 suggested Crown angle 38 & Pavilion angle 42</p><p></p><p>so all you need to do is reduce the quoted Crown angles of the design by 3 ( the difference between the materials) and leave the pavilion the same as the diagram you have. (There is no difference in this case of the pavilion angles between different materials)</p><p></p><p>Very simple & it works. Alternatively enter it into Gemcad with the material with RI 1.76 </p><p></p><p>good luck with the transposition of angles</p></blockquote><p></p>
[QUOTE="Dughug, post: 132213, member: 157"] Gordon, a simple way to adjust the angles is to look at the difference in Crown angle & Pavilion angle for the different materials. In the case of the design you want to work on Quartz @ RI 1.64 has a suggested Crown angle of 41 & Pavilion angle of 42 Corundum RI 1.76 suggested Crown angle 38 & Pavilion angle 42 so all you need to do is reduce the quoted Crown angles of the design by 3 ( the difference between the materials) and leave the pavilion the same as the diagram you have. (There is no difference in this case of the pavilion angles between different materials) Very simple & it works. Alternatively enter it into Gemcad with the material with RI 1.76 good luck with the transposition of angles [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
FACET DESIGNS
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