| 摘要 |
PCT No. PCT/GB95/02092 Sec. 371 Date Jun. 19, 1997 Sec. 102(e) Date Jun. 19, 1997 PCT Filed Sep. 5, 1995 PCT Pub. No. WO96/07895 PCT Pub. Date Mar. 14, 1996In order to test whether a diamond has had a layer of synthetic diamond material deposited thereon, infrared radiation including radiation of wavelength substantially 7 mu m to 25 mu m preferably 7 mu m to 10 mu m emitted or transmitted by the diamond is observed, to detect differences between the compositions of different zones of the diamond.
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