Blue Opal Sterling Silver PendantThe surface plays color like oil on still watershifting, layered, never fixed. Blue Opal is a hydrated silicon dioxide, an amorphous (non crystalline) mineraloid carrying 510% water within its silica structure. The color, from pale aqua to deep cerulean, comes from the diffraction of light through its submicroscopic silica spheres rather than from pigment. This piece is formed into a freeform shape and set in solid . 925 sterling silver, preserving