soft-spoken adjective. âº usually âspeaking in a âquiet âvoice: a soft-spoken, âunderstated âstyle. (Definition of soft-spoken from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
The laser drilling process involves the use of an infrared laser (of surgical grade at a wavelength about 1064 nm) to bore very fine holes (less than 0.2 millimeters or 0.005 inches in diameter) into a diamond to create a route of access to a black carbon crystal inclusion.
The quality of diamonds can be split broadly into gem, near gem, industrial and boart categories. In rare cases 90% of diamonds in a deposit are of gem quality; but most economic deposits contain 20 to 40% gem quality diamonds.utting and polishing of a rough diamond may start with 'cleaving' (splitting) a diamond along its grain (weaker crystal planes) to divide it into smaller pieces or remove flaws and impurities. Very thin circular metal blades impregnated with diamond dust or lasers are used to saw across the grain of diamond.