Blue amber is a rare variety of amber resin that exhibits a blue coloration. Blue amber has been found only in the Dominican Republic—especially in the amber mines around the city of Santiago and, less commonly, in the eastern half of the country.
Under artificial light, the amber appears like ordinary amber, but under sunlight it has an intense fluorescent blue glow. When held against the sun it will appear like ordinary amber, and under ultraviolet light it will glow a bright milky-blue.
Blue amber emits a very agreeable smell (aromatic molecules), which is different from regular amber when it is being cut and polished.