Here’s a classic, yellow gold engagement ring with curious carbonado, black diamond stone. Lovely excessive set gallery. Estimated across the 1930's-1940's. I had this checked by my jeweler as a result of the stone lit up my tester in a method I’ve not seen earlier than. He indicated that it was most probably carbonado, which is even more durable than diamond. Carbonados are black, industrial degree diamonds. Right here is a few historical past that I discovered:
Black diamonds have lengthy been prized by collectors of valuable gems. Louis XVIII is claimed to have bought a positive black diamond for what was, again within the day, a suitably kingly sum:
1"The well-known collector Dogni possessed a really superb specimen of this type which had been reduce with small sides and exhibited a vivid eclat It afterwards got here into the possession of Mr Bapst who disposed of it to Louis XVIII for the sum of twenty 4 thousand francs."
Carbonado may need an extraterrestrial origin, which might account for a few of its uncommon properties. In contrast to diamonds, carbonados are by no means present in igneous kimberlite rock shaped deep inside the earth however in alluvial, sedimentary deposits as an alternative. The micro-diamonds current in carbonado (sometimes smaller than 20 microns or 20 millionths of a meter) lack traces of minerals discovered deep within the Earth’s mantle, typical of different diamonds, however do possess traces of nitrogen, hydrogen, and osbornite (a mineral in any other case discovered solely in meteors) which suggests they originated in outer area.
Carbonados have been dated from 2.6 to three.eight billion years previous, which additionally may clarify why they’ve solely been present in Brazil and within the Central African Republic. Throughout that span of the Earth’s historical past, what’s now Brazil might have been joined to the western coast of Africa. (This “supercontinent” pairing truly preceded the better-known Gondwanaland). It’s attainable that a diamond meteorite struck the Earth at the moment, accounting for carbonado’s present distribution. (http://www.gemsociety.org/article/black-diamonds/)
Black Diamond – four.33 mm diameter (zero.33 ct approx)
Measurement of face – 9.61 mm sq.
Band width – 1.34 mm
Peak – 7.45 mm
Ring measurement – simply barely bigger than a 9 and sizable
Complete weight- 2.5 g
Situation-Good. The yellow gold does have put on underneath the loupe.
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