What is it about tiny, sparkly rocks that express so succinctly a particular strand of classic romance? We don't know; we're just talking monkeys floating on a rock in space, and somehow, shiny little adornments have become an important form of both currency and communication when it comes to the language of love. But good-quality, cool jewelry isn't cheap, and the high price tag is sometimes part of the appeal. Diamonds and cubic zirconia loo…