Tanzanite is one of the world's rarest gems. So rare that in the next generation the only way to possess Tanzanite will be to inherit it. Whether you are a collector' designer or someone simply looking for that dreamy blue tanzanite to set in a special jewelry setting; we offer quality tanzanite gems at a deep discount from retail. This is a AAA grade 1.75 carats Trillion Tanzanite in size: 7 mm. Please check the table below for more details.