Clean Your Diamonds

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Store diamonds individually: Although diamonds are the hardest naturally occurring substance on Earth, they can still chip. Store diamonds individually in soft cloth pouches that prevent jewels from bumping against one another.
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Clean diamonds regularly: Dust, skin oil, and other substances can cause your diamonds to lose their sparkle. Clean your diamonds regularly in soap and water. Air dry and polish with a soft cloth.
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Remove dirt from diamonds: Occasional brushing with a worn, soft-bristled toothbrush can help remove dirt from between crevices. For more resistant blemishes, use a weak solution of ammonia and water (about one part to four parts) and a soft brush.
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Protect metal jewelry settings: Treat metal settings gently as gold can scratch. Also, regularly ask your jeweler to make sure your diamonds sit tight in their settings to help prevent stones from falling out.
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Know the ins and outs of professional cleaning: A jeweler can clean diamonds with steam or ultrasound, though ultrasound can worsen internal fissures or flaws.