Can I wear a moissanite ring every day?

Quartz, which makes up most of the dust and grit on everyday surfaces, sits at 7 on the Mohs scale. Sand, concrete dust, kitchen grit and most household abrasives all fall in the 5 to 7 range. Moissanite at 9.25 is harder than any of those, so the stone does not pick up surface scratches in normal wear. The next material that can mark moissanite is sapphire at 9, and the only common material that scratches it easily is another diamond at 10. For a daily-worn engagement ring, the stone itself is effectively scratch-proof. Mohs is a ranked scale rather than a linear one, but at 9.25 the practical answer is unchanged.

The metal around the stone does the wearing. Gold at Mohs 2.5 to 3 and platinum at around 4 picks up surface scratches and develops a soft patina with daily use. Prongs gradually thin as they rub against fabric, and a thinned prong can release a stone. Yearly prong checks, ideally as part of a clean-and-polish at the jeweller, prevent the most common cause of stone loss. The other thing to watch is impact rather than abrasion: gripping a steering wheel, lifting weights and knocks against bench edges flex the prongs more than years of normal wear, and that is what loosens settings.