Quick answer: Clean diamond jewellery every one to two weeks with warm water, mild soap, and a soft toothbrush; store pieces separately so they can't scratch each other; and have prongs and settings professionally checked about once a year. Stop wearing a piece immediately if a stone ever feels loose.
A quick clean every one to two weeks keeps everyday pieces like engagement rings looking their best, since diamonds attract oil and lotion that dulls their sparkle far more than dirt does. Pieces worn less often need cleaning less frequently, but should still be checked before any special occasion.
Soak the piece in warm water with a few drops of mild dish soap for 20-30 minutes, gently brush the stone and setting with a soft toothbrush, then rinse and pat dry with a lint-free cloth. Avoid ultrasonic cleaners on pieces with fracture-filled stones or delicate settings, and avoid chlorine and abrasive cleaners entirely.
Store each piece separately, in a fabric-lined box or individual pouch, so diamonds can't scratch other jewellery or each other. Diamond is the hardest natural material, so even diamond-on-diamond contact in a shared drawer or box can chip a girdle or damage a setting over time.
Roughly once a year for pieces worn daily. A jeweller checks that prongs haven't worn thin, the stone hasn't shifted, and the setting is still structurally sound, catching small issues before they turn into a lost stone.
Stop wearing the piece and have it checked immediately. A stone that moves or feels loose, even slightly, is at real risk of falling out entirely, and re-tightening a prong is a minor repair compared to losing the stone.
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