Bangkok is a large city when it comes to gems, gold, silver and jewelry. However, keep in mind to be careful when purchasing these high priced products, so you don’t end up getting ripped off. The best advice to give is that you visit a trustful and well-reputed gems shop.
Is it possible to avoid getting cheated when buying gems in Bangkok? Well, a good advice is that you make sure to visit a well-reputed and trustful gems shop. It is possible to find such shops on your own or together with a professional tourist guide. What you should definitely not agree on, is to follow someone who claims that a tourist attraction is closed and instead wants you to go on a “free” sight-seeing tour in Bangkok. As you might already know, there is no such thing as a free lunch. In this case you will end up either by paying in terms of opportunity cost; by spending your time on something you probably didn’t really want to do, or in actual measures when buying something at a higher price than the real value of the product. Even worse is that you might be taken to a shop that is not to be trusted.
The world’s largest gems boutique is located on Rama VI Road in Bangkok and is named Gems Gallery. Should you be interested in getting here, we would like to advise you to come together with a tourist guide as the gems complex is somewhat complicated to find. The owner of Gems Gallery started his business from empty hands, but has come to build an empire of gems shops around Thailand. Hence, Gems Gallery branches are to be found not only in Bangkok but also in Chiang Mai, on Phuket and in Pattaya.
According to what we understand, Gem Superstore opposite Crown Plaza Hotel is a well reputed gems shop. The most convenient way to get here is by skytrain (get off at the Surasak station). The address is 314 Silom Road. Other places to buy gems and jewelry are Lotus Art de Vivre on Charoenkrung Road Soi 38, Bangrak (not too far from the skytrain station Saphan Thaksin) and Astral Gemstore Talisman on 99/22 Lang Suan Soi 7 (near Chit Lom station if you go by skytrain).
Before you decide to buy gems in Bangkok, a good idea is to search on the internet for black listed gems shops. One such list is to be found here. 
