This is a fluoresent Opal from Shikaoi, Hokkaido, Japan, featuring a spectacular bands of color that create an artistic effect, as if made by human hand. When certain molecules absorb UV light, the electrons get excited to a higher energy level. When these excited electrons return to their ground state, they release energy (light), which causes the opal to glow. The specific wavelength of light emitted determines the color of the fluorescence. This piece will provide hours of visual delight and wonder at nature’s artistry. Our 1” thick polished blocks stand upright on flat surfaces and are made from a superior cast method for clarity, depth and realism. The print is created by the artisan Giclee process and has been enlarged for a superb viewing experience. Makes a stunning showpiece on shelf, desk, table! Also, a great gift for any occasion. Photo credit: Greg Vella.