1 koh i noor diamond a british crown jewel the koh i noor is a 106 carat diamond which was once the largest diamond in the world.
Most famous precious stones.
This is one of the largest star sapphires in the world and the most famous.
This gem has.
The average price per carat is 1 200 for high quality stones.
The elusive gemstone weighs 306 carats.
The royal one is the most precious black opal in the world valued at 3 million.
In order to maximize color potential seek stones 5 carats or greater.
Light bouncing from the mineral rutile which is included in the stone forms a star pattern.
The most prized color is a pure blue that is almost indistinguishable from blue sapphire.
The size of a golf ball the gem has been polished to the shape of a dome to enhance the star s beauty.
In fact it went unreported for 14 years before the miner who had discovered it decided to sell.
Most tanzanite owes its color intensity to heat treatment.
The elusive gemstone weighs 306 carats.