bar01
Brilliant_Rock
- Joined
- Jul 13, 2004
- Messages
- 622
Hi folks,
Not as active on PS as I used to be - so this is old news for some of you. I know Vincent posted on this back in March, but I found This AGTA Article very interesting. Partial info below.
"GIA recently tested a parcel of 56 suspect blue sapphires provided by Vincent Pardieu of Bangkok''s Asian Institute of Gemological Sciences (Pardieu, 2006)..... In all cases, the levels found were high enough that they would seem to preclude accidental contamination....
As a result, the policy of the AGTA GTC from now on will be that all corundums showing signs of long-term/high-temperature heat treatment will require advanced testing before beryllium diffusion can be ruled out.
With the commercial appearance of beryllium-diffused blue sapphires, we can expect a further acceleration of the trend towards sapphires that have had no heat treatment whatsoever....."
Not as active on PS as I used to be - so this is old news for some of you. I know Vincent posted on this back in March, but I found This AGTA Article very interesting. Partial info below.
"GIA recently tested a parcel of 56 suspect blue sapphires provided by Vincent Pardieu of Bangkok''s Asian Institute of Gemological Sciences (Pardieu, 2006)..... In all cases, the levels found were high enough that they would seem to preclude accidental contamination....
As a result, the policy of the AGTA GTC from now on will be that all corundums showing signs of long-term/high-temperature heat treatment will require advanced testing before beryllium diffusion can be ruled out.
With the commercial appearance of beryllium-diffused blue sapphires, we can expect a further acceleration of the trend towards sapphires that have had no heat treatment whatsoever....."
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