Unless you buy vintage, it’s tricky pinning down the exact source (and ethical baggage) of a given diamond. To guarantee that your new stone wasn’t cause for crossfire and exploitation, head to San Francisco-based Brilliant Earth. Dedicated to environmentally and socially responsible business, all of its diamonds and sapphires come directly from conflict-free mines in Canada, Australia, and Malawi. The company also uses reclaimed gold and platinum, carefully re-refined to be as shimmery as ever. Another plus: They donate 5% of all profits to global communities ravaged by the jewelry trade.

Available online at brilliantearth.com.