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40mm Bearing Cutter 90° Burr
Made in the USA
x Length Int
clock hand pivots
3.16ct Oval Cabochon Ruby 8.5x7.4mm Bocks Swiss Lapping Machine 40mm Bearing Cutter 90° BurrRubys hues vary from orangey red to purplish red and the presence of chromium is the trace element that causes the unparalleled ruby red colour. The most valuable colour is the pigeons blood variety which is a vibrant red without any orange or purple tint. Some rubies display the gemmological phenomenon called asterism where cabochon cut stones have a whitish star on top of the dome. This is created by fine intersecting rutile needle inclusions.;
US$ 22.00
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