Larimar

There is a stone that is found exclusively in the Dominican Republic called Larimar.  It is a beautiful blue stone.

They make jewelry from his stone and it can be found in jewelry stores and from some street vendors.  Its coloration varies from white, light-blue, green-blue to deep blue.^[5] Quality grading is according to coloration and the typical mineral crystal configuration in the stone. Larimar also comes in green and even with red spots, brown strikes, etc., due to the presence of other minerals and/or oxidation. But the more intense the blue color and the contrast in the stone, the higher and rarer is the quality.

Larimar is a semiprecious stone that most closely resembles turquoise. Discovered in the 1970s the Dominican man who introduced the gem named it after his daughter, Larissa, and the stone's remarkable shade of blue like the sea ("mar" in Spanish). Larimar is rumored to channel healing energy by unlocking the wearer's heart, throat, third eye and crown chakras. Its healing properties let the stress and anxiety of everyday to roll away.
As with everything, some people try to sell you fake jewelry.  Genuine larimar stones are opaque, cloudy and hazy. Light does not pass through a real larimar stone. Lift the stone up to a light source -- natural light is the best and most accurate one -- and observe if light goes through the stone. If it does, that is an obvious sign that the stone is a fake.
Study the stone's coloring. The mysteries of the larimar stone are as vast as the ocean due to its diverse chemical composition. While the overwhelming majority of larimar stones have a turquoise and/or aqua coloring, they also have patches or traces of other colors. These other colors are "white, yellow, brown and other earth tones like gray, black, violet or rose," according to the Larimar Museum. These patterns, patches and traces of color can come in a myriad of combinations. If the stone seems too monochromatic and perfect, it is probably a fake.

This is a beautiful stone only found here in the Dominican Republic. 
It is excellent!