Wipe off excess oil with a dry towel. Do not immerse the opal in oil or let it soak in any liquid. Soaking may damage the stone. Emeralds Avoid wearing emeralds while doing rough work or participating in active sports. Emeralds are fragile and are susceptible to damage from a hard blow or knock.
Ultrasonic cleaners can worsen inclusions and weaken color.
Never leave jewelry in a hotel or motel room. Whenever possible, place jewelry in a safety-deposit box when you are not wearing it, even for part of a day. Never go sight-seeing with valuables in a purse or pocket.