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.

GENERAL ELECTRIC SYNTHETIC JADEITE

DEFINITIVE PROOF OF SYNTHETIC ORIGIN

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 SAS2000 Spectrophotometer 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.

In what may turn out to be the classical proof of the synthetic origin of General Electric synthetic jadeite, SAS2000 Photoluminescence Spectrophotometry
has discovered evidence of synthetic RUBY in General Electric synthetic Jadeite.

In General Electric's patent application for the production of synthetic jadeite US20030031869, available online at
http://appft1.uspto.gov/netahtml/PTO/srchnum.html, General Electric utilized the SAS2000 Spectrophotometer Analysis System and
published SAS2000 spectrophotometry data in support of their patent.

Figure 1 is that of figure 12 from this patent application, showing an example of the finest color in Imperial jadeite, synthetic or natural.

Figure 1

In the sample of GE synthetic Jadeite examined, the visible near Infra Red spectra, shown in Figure 2 showed what might be two possible, but not definitive, indicators of the GE synthetic jadeite, namely the LACK of a 437nm (Fe+++) absorption line, and a sloping down of the transmittance in the near InfraRed portion of the spectra.  It might be noted that the lack of the 437nm absorption is consistent with GE data published in their patent and consistent with the apparent fact that no Iron is intentionally added to the GE product, but is inconsistent with GIA's published observation of a 437nm feature using a desk model spectroscope.
 
 

Figure 2

When we took SAS2000 Raman/Photoluminescence spectra on our sample, we were not surprised to find that the synthetic jadeite
(NaAlSi2O6) showed the identical "ruby" (Al2O3 +Cr) doublet previously found by Adamas Gemological Laboratory (and verified
independently in Belgium) in synthetic near colorless diamond samples supplied from multiple sources ( see
http://www.adamasgem.org/raman.html).

In the HPHT process for synthetic jadeite production, as in some near colorless synthetic diamond, because all the elements (Al, Cr, O) are there for production of trace concentrations of "ruby", it is only expected that some traces of ruby would show up.

Figure 3 clearly shows the differences in the photoluminescence peaks of GE synthetic Jadeite versus natural material. Figure 4 shows the major ruby doublet peak at 693.7nm

Figure 3

Figure 4



 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 SAS2000 Spectrophotometer   Questions, Comments, Product Support AD