: Natural, untreated stones are the most valuable. Many sapphires in India are heat-treated to improve color or clarity, which is acceptable if disclosed, but glass-filled stones are of significantly lower quality and should be avoided. Perform On-Site Tests :

: In a dark room, shine a flashlight on the stone. A genuine sapphire should only reflect blue light, not a rainbow of colors. A Note for Tourists: Avoid the "Tax-Free" Scam

: For those looking for wholesale options, Bowbazar is a "hidden haven" known for quality stones at competitive prices. Understanding Origin and Quality

To ensure you are buying a genuine, natural stone, follow these expert rules: