Shopping for jewelry in Bangkok can be very profitable and fun. But you have to be aware that there are unscrupulous people that may try to scam you.
Never let a tuk-tuk driver take you to a jewelry store. A tuk-tuk is a small, open air, motorcycle driven, 3-wheeld vehicle. The driver may offer to take you anywhere you want to go for free or for a ridiculously low price.
The driver may take you to a legitimate tourist attraction or temple where you will be met by someone claiming that the venue is closed. He will try to gain your confidence and offer to take you to a jewelry store where you can make a big profit. Everyone will get a commission and you will be sold inferior grade gemstones.
You are better off going to a reputable jewelry store. Keep in mind that almost any store recommended to you will be paying a commission to the recommender. You want to find a store that has been in the same location and has a solid reputation. But, how do you find one.
I would search around the internet and find some jewelry stores that look “OK”. Then I would visit some of the online forums and ask around for good and bad experiences. It may...