Prince William proposed to Kate Middleton with his late mother's 18-carat oval sapphire engagement ring surrounded by 14 diamonds, which means "regular" blue sapphire engagement rings are poised to stage a major comeback. Check out these fit-for-a-princess look-alikes, starting at $60.

18k white gold ring with oval sapphire and diamonds, $5,454, Yael Designs

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Photo: Courtesy of Yael Designs