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The Passion of

Colored Gemstones

Opal


According to Arabic legend, opal was believed to contain lightning.​
Writers have compared opal’s color to volcanoes,
galaxies and fireworks. Admirers gave extraordinary
opals poetic names like Pandora, Light of the World and
Empress. In ancient Rome, this gem symbolized love
and hope. The Romans gave it a name—opalus—that
was synonymous with “precious stone.” Many cultures
have credited opal with supernatural origins and
powers. The ancient Greeks believed opals gave their
owners the gift of prophecy and guarded them from
disease. Europeans have long considered the gem a
symbol of hope, purity and truth.

​Play-of-Color
Opals display a phenomenon known as play-of-color.
When a stone has play-of-color, it is referred to as
precious opal. The main categories of precious
opal are white, black, boulder, and crystal or water.
Fire opal, also known as Mexican opal, sometimes
doesn’t show play-of-color.

Clarity
With an opal, clarity is its degree of transparency and
freedom from inclusions. An opal’s clarity can range
all the way from completely transparent to opaque.
A cloudy or milky background color can sometimes
signal a lack of stability. Opals can have fractures and
surface blemishes. Matrix, or host rock, along with signs
of crazing, a fine network of cracks, have an impact on
opal’s durability and value.

​Source
Fine opal comes from all over the world. The most
significant sources are Australia, Mexico and Ethiopia.

Treatments
Opals can be treated by impregnation with oil, wax or
plastic. Opal doublets or triplets are thin slices of opal
glued to a base material and covered with a thin dome
of clear quartz. These gems are more resistant to
scratching but are considered less valuable. Some
opal can be dyed.
Picture
Picture

​Fire opal is transparent to
translucent with yellow,
orange or red bodycolor.


​White opal is light in
tone, translucent to
semi-translucent with
play-of-color.
Picture
Picture


​Black opal is dark in tone,
translucent to opaque with
play-of-color.
Boulder opal is translucent
to opaque with play ofcolor against a light to dark background. Fragments of the surrounding rock,
called matrix, become part
of the finished gem.
Picture
Picture

All information are courtesy of Gemological Institute of America (GIA). OR DIAMOND are not affiliated with, connected to, or associated with GIA other than selling diamonds and gemstones graded by GIA and have GIA trained staff gemologist and accredited jewelry professional on site. 
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  • Engagement Ring
  • Wedding Band
  • Jewelry
  • Diamonds
  • Moissanite
    • Charles & Colvard
    • NEO Moissanite
  • 3D Custom Design
    • Design Process
    • Meet Our Team
    • Jewelry Re-Design
    • Gallery
  • Services
    • Repair >
      • Jewelry Repair >
        • Before & After Gallery
      • Pearl Restring
      • Watch Repair
      • Services >
        • Engraving
        • Appraisals
        • Gemstone Finder
        • Jewelry Re-Design
        • CAD/CAM 3D Custom Design
  • ABOUT
    • About Or Diamond >
      • Our Story
      • Meet The Team
      • Our Showroom
      • Our Guarantee
      • Our Blog
    • Jewelry Guides >
      • Engagement Ring Guide
      • Anniversary Gift Guide
      • Birthday Gift Guide
      • Metal Guide
      • Care Recommendation
    • Precious Stone Guide >
      • Learn About Diamonds >
        • Color
        • Clarity
        • Cut
        • Carat
      • Learn About Moissanites
      • Learn About Gemstones
      • Lab / Synthetic / Imitation
      • Birthstone List