Martin Katz was on a mission. It was the last Tuesday in January and the Beverly Hills jeweler was at LAX, getting ready to board a morning flight to Tucson, Ariz., where he would spend the afternoon ...
Topping his shopping list? Paraíba tourmaline. The rare Windex-blue colored gem was discovered in the Brazilian state of Paraíba in 1989 and has since become a poster child for appreciating value in ...