ADAMAS GEMOLOGICAL LABORATORY publishes gemologically oriented software for the jewelry appraiser, jeweler, or student in gemology or mineralogy. The laboratory also provides technical consulting and jewelry appraisal services to the trade and the public and expert witness services to the legal profession.

NovaDiamond Green Transmitter Spectra

SAS2000: Developed, Produced And Supported In The USA   Questions, Comments, Product Support
Adamas Gemological Laboratory is proud to introduce to the industry the custom built SAS2000Spectrophotometer Analysis System for diamond and gemstone evaluation and grading. The SAS2000 provides the most accurate colorimetry available today for diamond color grading, helps determine radiation treatments of diamond, provides better ability than the DeBeer's DiamondSure to detect probable  synthetic diamonds , and replaces the spectroscope for transparent gemstone evaluation.

NEW NovaDiamond Green Transmitter Data

The following are spectra of the new NovaDiamond High Pressure, High Temperature HTHP treated diamond. Thanks go to Branko Deljanin and Greg Sherman of European Gemological Laboratory who first identified these anomolous stones submitted to EGL for certification as naturals, who questioned, and who persistantly tracked down the source as coming from NovaDiamond. The 870nm defect has not been previously reported in the literature as associated with the H2 defect or possible this particular process. Note: It has come to my attention that this defect was identified as a localized vibration mode at 1.424ev ( Collins et al, "The H2 optical transition in diamond; the effects of uniaxial stress pertubations, temperature and isotropic substitution." , J. Phys: Condensed Matter 4 pp 3439-3452)
 
 

The following LNIS transmittance graph shows additional features in the 600 to 700 nm band. Branko Deljanin from EGLNY  and I will publish further commentary on these samples as time permits and Greg Sherman and Branko Deljanin will be making a presentation in Tuscon at the AGA conference on the NovaDiamond process.
 
 


 
 





The 1.93 carat Vivid Yellow-Green diamond shown above is a very rare color.  In April 2000, Christie's Auction # 9334, lot # 530, a 1.73 carat OMC Vivid Green Yellow sold for $800,000.00.  It had "natural" paper from GIA dated February 11'th, 2000. I am told that the diamond sold at Christies had radiation stains, and could not have been HPHT'd.  The stone above was processed on December 18th, 1999 at NovaDiamond in Provo, Utah.

In August,  2003 the poorly cut diamond above was removed from the mounting, and was recut by EightStar Diamond Company into an EIGHTSTAR DIAMOND, the acknowledged standard for perfection in round brilliant cutting, with as near perfect optical symmetry as humanly possible. Mark Morrell of MWM JEWELRY then fashioned a platinum bezel for the old setting, which set off the vivid yellow color of the stone. (Sorry for the black pique', but there was a little grapitization because of the HPHT processing.)  Coupled with the finest cutting available in the world (EIGHTSTAR),  Mark's unique craftmanship, among, if not, the very best in the country, and his attention to detail, really transformed the diamond and the ring.
 


 
 
 
 
 
 
 
 
 
 SAS2000 Spectrophotometer   Questions, Comments, Product Support AD