Sapphire Treatment Update
October 9 -During recent months, we at the AGTA Gemological Testing Center have observed that some blue sapphires
reaching the US market show indications that they are being
treated by a new technique. Most of the gemstones observed range
in size from 2 to 17ct. Since these gemstones appear to be coming
from Sri Lanka, the AGTA and Sri Lanka dealers and associations
are working willingly and cooperatively together to determine the
exact nature of the treatment.
The characteristics may be easily observed when the gemstones are
viewed immersed in methylene iodide and illuminated through a
diffused light source. This makes it relatively easy to identify
the gemstones when buying or sorting. In addition, similar
characteristics have been observed in two rubies.