Opal Gold Jewellery Party Ring

Opal Gold Jewellery Party Ring.

Opal Gold Jewellery Party Ring
By Stome.

Visible light cannot pass through large thicknesses of the opal. This is the basis of the optical band gap in a photonic crystal. The notion that opals are photonic crystals for visible light was expressed in 1995 by Vasily Astratov's group. In addition, microfractures may be filled with secondary silica and form thin lamellae inside the opal during solidification.

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