What should you not clean a diamond ring with?

Toothpaste, baking soda, polishing cloths and household scouring products are abrasives, which work by being slightly harder than the surface they clean. Gold (2.5 to 2.9 on the Mohs scale), silver (2.7) and platinum (3.5) are all softer than typical toothpaste (around 3) and baking soda. That means each use leaves microscopic scratches in the band finish, even when the ring looks fine to the naked eye. The damage accumulates over years into a dulled band that needs professional polishing to restore. Diamond itself (10 on Mohs) is unaffected, which is why these methods seem to work at first glance: the stone still sparkles while the metal underneath quietly loses its shine.

Chlorine bleach and pool chlorine attack the alloy metals (nickel, copper, zinc) inside gold jewellery, even though pure 24k gold is non-reactive. Repeated exposure creates brittle compounds and micro-pits at solder joints and prong tips. Industry testing has recorded prong failure on 14k white gold after roughly 21 hours of direct bleach contact. Ammonia (in many glass cleaners and window sprays) damages softer gemstones and leaves a residue. Acetone and nail polish remover dissolve the glue used in doublet settings. Hand sanitiser leaves an alcohol film on the stone that dulls sparkle. None of these are immediate disasters in a single brief exposure, but as cleaning products they cause cumulative damage that warm soapy water never does.