Want something more precious than diamonds? How about a beautiful diamond created from your dead loved one? Seriously.
Check out LifeGem. They will create a colored (or colorless) diamond using cremated remains, or even a handful of hair, from you or your deceased buddy. You could be really creepy by proposing to your loved one with a "deceased mother-in-law" diamond ring!! OOH I LOVE CREEPY! Talk about an heirloom...
It's just creepy enough to be awesome.
But that's just my opinion.
better watch out, kitties...momma wants some bling!