I advise all backpackers and single tourists not to follow licensed tourist guides of Bangkok or join their tour groups to Bangkok's gem stores especially at its financial districts Sukhumvit and Rajathewi.
My China friend went to Bangkok recently with Valuair after being awarded a free air ticket to Bangkok. The tourist agency that cooperated with Valuair introduced him to a Thai qualified tour agent. He brought him and his friends to two gem stores at the district of Rajathewi and Sukhumvit. They bought later jewellery which were found to be fake. They lost money on this low-fare trip to Bangkok.
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At Least Do This: If you wish to visit qualified gem stores of Bangkok, go to the prestigious Jewellery Trade Centre along Suriwongse Road, which is near Silom Road. Look for the Mahan Air office building and one of the qualified jeweller y buildings is located here. Explore but do not buy if you suspect the quality of the jewellery.
Alternative: Visit the shopping centres in Silom Road.