Tumble Polished Gemstones
A tumbled-polished gemstone is one that has been smoothed and polished to a high gloss by slowly grinding the stones against each other in barrel-like tumblers. Depending on the stone type, and the skill of the person managing the process, it may take anything from a few days to several weeks to achieve the desired result. Although the tumbling process remains a fairly "mechanical" process, there is a great deal of skill involved in obtaining the desired "polish" to the different stone types. However the basic process is one of using a grinding paste of Silicon Carbide Abrasive Powder and water to grind the stones to shape followed by a final tumbling with a polishing powder.

A brief history of gemstone tumbling...,

Gemstone tumbling was started commercially in the United States in 1953. At that time, the tumblers used were literally no more than household paint cans, but as demand for the fabulous gemstone-products increased, the tumbler sizes increased until they reached the "6000-pound" tumblers which proved to be an ideal mix of size and efficacy. This size of commercial tumbler is still used today. The vibrating tumbler then entered the market as it speeded up the process of tumbling certain gemstone types and sizes.

Craftstones Europe keeps over 150 varieties of gemstones in stock, most of them have been processed in the factory in South Africa.