One of the
extremely in rare gemstones is called Blue Pectolite or Larimar. This gem can only be found in one area of the world. The area is quite inaccessible and mountainous. You'll find it in the Dominican Republic in the province of Barahona. The stone was first mentioned in 1914, but the stone really didn't make a major appearance until 1974. Here's a little bit more about Larimar stone.