Opal's Recuperating Powers: A Total Manual for Its Otherworldly Advantages As we know, any kind of gemstone Jewelry that we buy requires an optimum amount of care and maintenance to lock their original luster, structure, and healing attributes, the same goes with these Opal Sterling Silver Jewelry pieces that demand attentive overall care. Since these crystals typically contain 6-10% water during their formation, it is advised not to submerge them into water for extended periods.