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Think twice before putting gems in an ultrasonic cleaner. Diamonds and rubies and sapphires will be fine but many other gems may not be: when in doubt, leave it out. Diamonds, rubies and sapphires, and other single-crystal gems can be cleaned with a touch of ammonia in water to remove all films and add extra sparkle.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.