Browse our collection of semiprecious - Dyed tumbled stones made from agate at Hanifa Crystals. Dyed tumbled stones are often treated with dye to alter their color. If you see tumbled stones with outrageous colors, those stones have probably been dyed. Tumbled or Polished crystals have been processed by hand and/or machine and Raw or Natural crystals have not - they are pretty much as they came out of the ground. Both Tumbled and Natural crystals are effective healers and protectors. They offer different energies however they are both positive and effective. The market for spectacular tumbled stones is very small. They are sold as "collector's pieces" or as rough to people who will cut them into cabochons. We do not believe that premium tumbled stones are an investment opportunity. Their intrinsic value is very low and they are very difficult to sell at a premium price. Tumbled stones are often treated with dye to alter their color. If you see tumbled stones with outrageous colors, those stones have probably been dyed. Choose from a variety of tumbled stone available online and place an order today to avail them at a wholesale price