Fireworks. Jellyfish. Galaxies. Lightning.Opal shifting play of kaleidoscopic colors is unlike any other gem.Opal arrays of silica spheres form a fantastic variety of patterns and colors. No two opals are exactly alike.
Opal spectacular play of color can display all the colors of the rainbow.
Experts expect different levels of fire for different types of opals.
Fine opals are often cut into irregular shapes that keep as much play-of-color as possible.
Opals come in a wide range of sizes and carat weights. Common sizes for many of the opal cabochons set in jewelry are 6×4, 7×5, and 8×6 mm.
Grids of silica spheres 0.2 microns in size create red play of color flashes.
Opal contains up to 20% water trapped in its silica structure.
The novel Anne of Geierstein gave opal a reputation of being unlucky.