Due to the dark nature of this business, I am loath to recommend tourists to the seedy world of gemstones. However, Uthai appears to be the most honest broker in Bangkok, and can custom design jewelry for you with rubies, sapphires, and emeralds.
28/7 Soi Ruam Rudi, Ploenchit Rd., Ploenchit
Our Rating Transportation BTS SkyTrain: Ploen Chit Phone 02 253 8582
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.