Dominican blue amber is blue, but not in the way you might think. The pieces below are taken in natural daylight on two different surfaces.

When natural light strikes Blue Amber on a white surface, the light particles pass right through, and then are refracted off the white surface. Result: the Blue Amber has a slight blue hue. When the same natural light particles strike the Amber on a black surface, the light particles don't refract off the black surface, thus refracting off the actual Amber. Hydrocarbons in the Blue Amber turn the sun's ultraviolet light into blue light particles, resulting in the famous glow of Blue Amber.
This effect is only possible in the Dominican Republic Blue Amber category. Any other Amber (such as Baltic Amber) will not display this phenomenon.
Qualities of Dominican Blue Amber:
· it turns blue in sunlight and several other light sources
· the lack of fossils
· it glows in UV light (fluorescence)