When it comes to selling precious stones online, there are some basic rules to follow. If you are looking to sell gemstones or gemstone jewelry, the first step is to determine the market value of your gemstones. You can consult a gemologist or the gemological institute of america to get an idea of the value of a gemstone. Once you have an idea of the value, you can start looking for potential buyers. The best place to sell your precious gemstones or gemstone jewelry is through jewelry stores, online platforms, or even auction houses. It is important to find the right place to sell your gemstones in order to get a fair price for your items.