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Nailhead
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
Round brilliant diamond with a dark centre which resembles the head of a nail; caused by a pavilion depth greater than 48 percent.
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Pavilion angle, английский
The angle measured between the girdle and the pavilion main facet.
Mohs scale, английский
- The 10 point scale of mineral hardness. diamond scores 10 on the mohs scale. diamond is the hardest of all known natural substances.
- The mohs scale of mineral hardness was created in 1812 by the german geologist and mineralogist friedrich mohs. it characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. for example a diamond is the hardest substance known at a 10 on the mohs scale.
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