In what may turn out to be the classical proof of the synthetic origin
of General Electric synthetic jadeite, SAS2000
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.
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.
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
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