Flux for blue sapphires?

[haagen_dazs]

How common are flux filled blue sapphires?
Correct me if I am wrong but I believe briefs from AGL and AGIS do tell if flux filling is present in a gemstone eg ruby
I have not seen flux filled blue sapphire briefs.
Is if because the briefs do not cover flux filled BLUE sapphires or are they rarer or .....??

Someone could enlighten me on this.

 

[T L]

Here's the AIGS website page for their heat treatment categories. If there is a foreign substance found, then it has been flux treated.

Flux filled gems are very very common. They're readily all over the place, so when spending a significant amount on a gem, it's important to get them checked out by a reputable lab.

http://www.aigslaboratory.com/AIGSPage.aspx?mID=3&sID=66&type=NewDisclosureCommentsforHeatProcess

AGL also discloses this. Both are sophisticated labs and would be capable of determining flux and the type.