Found in just one place on earth, tanzanite is a relatively recent discovery. Tiffany & Co named this blue-violet variety of zoisite in honor of Tanzania, where it was first unearthed in 1967. As well as being the birthstone for December, tanzanite is also the gem for a 24th anniversary. 
This gorgeous tanzanite weighs just under a carat at .99 ctw and is set in 18k white gold. Accented by .10 ctw of diamonds, this ring would make a wonderful gift. Ring is currently a size 7 and is sizable for an additional fee.