Most diamond wedding ring are over three billion years old, two-thirds the age of the Earth. There are a few "youngsters", though, which are only 100 million years old.
Instead of just white, Tiffany Style Diamond actually come in a rainbow of colors because engagement rings can be as colorful as any other gem.
Factors important in selecting a fancy shaped fancy diamonds include all of the 4Cs as they apply to the round shape.