We recently came across this lovely sapphire at the Jewelry Trade Center in Bangkok. The color was so so vibrant, I knew I had to buy it. We brought it upstairs to the GIL lab for analysis which confirmed to us what we thought we knew. That the sapphire was of Sri Lanka origin and only treated with simple heat. You can see some light color banding of color in some lights but not visible on your hand or once set. The sapphire is eye clean in clarity and is a stunning Cornflower Blue in color.