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.

14k white gold and diamond ring with cushion-cut sapphire, $11,995, Diamond Ideals

See more cushion-cut engagement rings.

Photo: Courtesy of Diamond Ideals