Diamonds may be the conventional choice for most engagement ring buyers, but since when do millionaires heed convention? Grunge star Kurt Cobain gave fellow rocker Courtney Love a 5-carat diamond-and-ruby engagement ring. Unfortunately for Love, the ring was stolen on Valentine's Day in 1995. Hopefully, prospective buyers of this three-stone oval ruby-and-diamond ring from House of Taylor will have better luck -- and some insurance. The piece, which features 12.48-carat Burmese rubies, sells for $63,600.