Does anyone have any experience using UV light to help determine what a gemstone is and whether it is synthetic or not in conjunction with the RI of the stone? The color is as follows:
GWLAb: Vivid Purple
GIA: Medium dark, Moderately Strong, Purple
This particular stone is supposed to be a purple sapphire.
The following is what it looks like under short wave UV light from my UV light cabinet.
The following is what it looks like under long-wave UV light in the light cabinet.
The RI is 1.768
Is this synthetic?