Examining a diamond

摘要

PCT No. PCT/US96/01751 Sec. 371 Date Mar. 27, 1998 Sec. 102(e) Date Mar. 27, 1998 PCT Filed Jul. 22, 1996 PCT Pub. No. WO97/04302 PCT Pub. Date Feb. 6, 1997In order to test whether a diamond has had a layer of synthetic diamond deposited thereon, it is irradiated with high energy ultraviolet radiation to cause emission of luminescence, the luminescence intensity produced by different zones of the diamond being measured and compared. In one embodiment an integrating enclosure (15) is used and the diamond (13) is mounted on a rotatable mount (14).