20:57
Mody87
Crystals free of defects in weight of 0,02 0,2 carats are used learn more on engagement rings http://www.offshelf.com/. plates with the most thin apertures drilled in them which are used for wire drawing. Diamonds should be transparent, free of defects, cracks, bowls and extraneous inclusions, at weight of crystals of 0,1 3,5 carats. Apertures drill ultrasound by means of diamond needles and suspension from 50 of a diamond powder and 50 of water. Recently began to use a laser method. One diamond replaces 245 dragged from firm alloys, at increase in speed of drawing in 2 3 times.
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