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Tuesday, 18 September 2007

Dudley diamond. See star of south

africa DIAMOND.

durability (of diamond). The durabil­ity of a gem depends both on its hardness and toughness. It may be quite tough but rather easily scratched, or it may be exceedingly hard but lack toughness because of easy cleavage. Diamond is highest on the scale of hardness, and despite its rather easily developed octahedral cleavage, it is among the toughest of Gemstones. See cleavage, cleavage (in

DIAMOND), HARDNESS, MOHS SCALE, TOUGH­NESS.

Dutch bort. A misnomer for zircons found in the South African diamond mines.

Dutch Guiana. See Surinam.

 
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