opal Featured Gem Opal

Fireworks. Jellyfish. Galaxies. Lightning. Opal's shifting play of kaleidoscopic colors is unlike any other gem.

Opal's microscopic arrays of stacked silica spheres diffract light into a blaze of flashing colors. An opal's color range and pattern help determine its value.

BIRTHSTONE: October
overview
In Rome, the opal was considered the most precious gemstone, because it contained all colors. No two opal gemstones are alike, as they each have their own unique color patterns. When opal is formed, the silica gel is embedded in rocks in little spheres giving each gem its uniqueness.
Opal Earrings
Opal Ring
Opal Bracelet
0.2 microns

Grids of silica spheres 0.2 microns in size create red play-of-color flashes.

1829

The novel "Anne of Geierstein" gave opal a reputation of being unlucky.

20% water

Opal contains up to 20% water trapped in its silica structure.

QUALITY FACTORS 
color
Color Diamond

Opal's spectacular play-of-color can display all the colors of the rainbow.

clarity
Clarity Diamond

Experts expect different levels of clarity for different types of opals.

cut
Cut Diamond

Fine opals are often cut into irregular shapes that keep as much play-of-color as possible.

carat weight
Carat Weight Diamond

Opal has relatively low density so even larger sizes can be comfortable to wear.