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Designed by two friends turned cofounders from Rio de Janeiro, the Dois Irmãos ring takes inspo from the clean curves of midcentury Brazilian furniture. The silhouette is split down the middle—one side cast in white gold, the other in rose gold—with sparkling round-cut diamonds bridging the two sides. But our favorite detail is something you can’t see: a hidden mechanism on the inside of the ring that lets you adjust the size (handy for any swelling that happens during the summer).

• 18k yellow gold
• 2 round cut diamonds (0.25 ct each)
• Made in Italy