Setting them in jewelry is tough on them. If an Opal was likely to crack, it would probably have done so before you ever had the opportunity to buy it. I do a lot of Opal cutting and some do crack while I'm cutting them, and some even crack afterwards. It can be really heartbreaking with a stunning Opal. The good news is that those never make it into jewelry, so you don't have to worry about them.
Opals are harder than most people think.
You can clean it with mild detergent and a toothbrush. Return to Top Return to Main Menu K is for karat, which is gold purity. 14ky means 14 karat yellow gold. CT is the abreviation for carat which is a measure of gem weight. A 14k ring may contain a 4ct amethyst.