I would like to know if any one knows of, or even if there are any unique metals available to make wedding/engagement rings out of. I''m looking for something other than gold, platinum, or even titanium, but something that will hold up as well. Perhaps even some variations of gold, for example, I''ve seen some jewelry made with "purple" gold, as in this link http://www.aspial.com/JewelleryExpertise/je_pg1.html. Thanks for all the information