Diamonds
Vodka is an old-school hack for cleaning diamonds, but most jewelry experts don’t recommend it. Diamonds are very hard so they’re quite durable. You can clean them with a mixture of 6 parts ammonia and 1 part water. Dunk your diamonds and clean with a soft toothbrush.
Other Gems
Good old soap and water will do the trick for most gemstones. Some gems are heat or light sensitive and generally more easily damaged. Opals and emeralds, for example, are prone to fracture and topaz can fade. If you aren’t sure of the best jewelry cleaner for your stones, check out the Gemological Institute of America (GIA) for the specifics on each one.
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