Blue is the color
...sapphire remains strongest, tanzanite selling well
Prices for fine blue sapphires over 5 carats limit consumer
access so color substitution creates demand for other blue gems.
The colored stone market turned an important corner during…
Geological Society of America, founded in 1888, is one of the biggest and most
influential geosciences organizations in the world. GSA has more than 25,000 members spread out in 107 countries. The society celebrated its 125th…