I've done this before but a recent post in
mezroc journal made me curious again...
What's your favorite gemstone?
Ruby is my favorite and this is one of the most famous ruby's in the world, found now in the Smithsonian's Gem Wing. The Carmen Lucia Ruby, donated by her husband as a memorial to his wife.
if you want to know more about the story you can find it here:
http://www.professionaljeweler.com/archives/articles/2005/mar05/0305adv.html