As you can see from the pictures, this gemstone is the bluish-green color that makes Australian sapphires unique. This sapphire is not heat-treated. This is the largest Australian sapphire we have, almost 4 carats. We considered holding this gemstone for future release to take advantage of the anticipated rise in prices of Australian sapphires, but decided to add it to our current inventory. This sapphire would be perfect for either a ring or pendant, surrounded by diamonds.