I recently bought a sapphire, from a reputable jeweler in another city, that was sold as a natural Kashmir sapphire. A jeweler (who has not seen the stone) thinks it is unlikely that it is a real Kashmir at the price I paid. I showed it to a jeweler in my city that may be setting the stone for me. She remarked that it had a "velvety texture" and was probably a Kashmir. How can you tell for certain?