The only place in the world where is found blue jadeite. This stone was the most valuable material for the Olmec civilization.
The best-known find of the extremely rare cobalt blue spinel is Lục Yên in Vietnam. Local gemstone mines provide also sapphires and rubies.
Ancient, more than 2000 years old mines of turquoise, considered to provide the best quality turquoise in the world. Mine is closed now.
Now legendary, abandoned sapphire mines where the best sapphire in the world was mined.
The first find of deep blue beryl – maxixe, discovered in 1917. Stones quickly discolored and lost their value, thus the mine was abandoned.
For several millenia here is mined the best lapis lazuli in the world.
The only find of benitoite of gem quality.
World’s only find of tanzanite – unusual, deep blue gemstone.
The only commercial find of blue garnets in the world, a pyrope-spessartine with vanadium content. Some of these stones have a color change effect – from blue in daylight to red in artificial light.
The richest finds of the fluorescent Dominican blue amber- a stone that changes its color according to lighting conditions. Dominican amber (but not the blue one) is found also in many other mines in three regions – La Cordillera Septentrional, Bayaguana and Sabana de la Mer.