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Turquoise is mined in many places around world including Iran, China, Turkey, Persia, Egypt adnNorth America. The color of stone depends on minerals that are in ground. Blue stones are found where copper is present, green stones are found where iron is present a yellowish green stone which is quite rare is found where zinc is present and White Buffalo turquoise found in Nevada is mined where there are no minerals present.
If you wear turquoise jewelry, take care to clean it carefully. This porous stone can be easily damaged if submerged in chemical cleaners. Never use steam or ultrasonic cleaners for your gemstone jewelry. The gentlest method of cleaning is to dip a Q-tip in warm soapy water and wipe stone with that - wipe again with plain water to remove any soap residue.
Lee Dobbins is owner and editor of Artisan Jewelry Online where you can learn more about turquoise jewelry.