Exercise care in protecting your investment and your selection of authentic Indian jewelry will bring you enjoyment for years to come. Turquoise Turquoise is a porous stone. In even the hardest turquoise, deposits collecting in the pores of the stone can cause a color change. Therefore, care should be taken to protect the stones from oils, grease and chemicals. Always remove rings and bracelets before washing dishes or doing dirty work. Hand lotion can change the color o