Examining a diamond

摘要

PCT No. PCT/GB95/02093 Sec. 371 Date Jul. 21, 1997 Sec. 102(e) Date Jul. 21, 1997 PCT Filed Sep. 5, 1995 PCT Pub. No. WO96/07896 PCT Pub. Date Mar. 14, 1996In order to test whether a diamond has had a layer of synthetic diamond deposited thereon, the surface area of the natural part of the stone is measured by measuring the radiant-flux density of radiation substantially of wavelength 230 nm to 320 nm in an integrating sphere containing the diamond. This is compared to the total surface area of the diamond.