Date: 9/1/2005 1:01:17 AM
Author: Garry H (Cut Nut)
The trouble is that aussies seemed to always have a rough ride to this island (usually in chains).
Infra red spectroscopy, Raman-photoluminscent spectroscopy, Cathodeluminscent spectroscopy & to a lesser extent UV/VIS/NIR (ultra-violet/visible/near infra red) spectroscopy are the methods of choice for identifying Type IIA brown diamonds which have been decolorized using HPHT (high pressure, high temperature) treatment.Date: 9/3/2005 12:36:04 AM
Richard, besides Golconda stones, are Type II also indicative of HPHT? If one had a D color diamond with indicative graining determining Type II is there a test to determine HPHT besides Infra red?