Where can I buy rubies in Thailand?

The quality of rubies in tourist shops in Thailand varies greatly according to different shops. Most of the rubies in large state-owned tourist shops are real rubies, but they are often of low grade, and most of them are heated and optimized rubies, and some of them are even filled with glass. Small tourist shops are either of poor quality or artificial rubies. When traveling in Thailand, if you buy gem products, you should keep in mind one principle, that is, you should be cautious when it exceeds 1000 yuan, because even if you buy a fake, if it is below 1000 yuan, it will be worn as an ornament, but if it is expensive, once it is a fake, the loss will be great.