All stones and metals aren’t created equal, so it’s important to understand the nature of your fine jewelry before making treatment decisions. Concerning stones, they have a hardness factor based on the Mohs scale. Diamonds rank the highest, which means they’re most durable, and rubies and sapphires rank next. Emeralds, opals, and pearls are more delicate, which means they’re not ideal for everyday wear, so the best means of maintaining them begins with refraining from wearing them daily.