Natural opals are usually described as light, dark/black, boulder, and matrix. Although boulder opal has an ironstone backing, it is regarded as a solid natural opal because this backing occurs naturally. The variety of natural opal is determined by the two characteristics of body tone and transparency.
1.46  Carats Natural Fire Opal Gemstone Cabochon | 9.08mm x 9.24mm - Modern Gem Jewelry 1.46  Carats Natural Fire Opal Gemstone Cabochon | 9.08mm x 9.24mm - Modern Gem Jewelry
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1.45 Carats Natural Fire Opal Gemstone Cabochon | 9.08mm x 9.24mm
$120.00
1.63 Carats Natural Fire Opal Gemstone Oval Shape | 6.8mm x 4.3mm - Modern Gem Jewelry 1.63 Carats Natural Fire Opal Gemstone Oval Shape | 6.8mm x 4.3mm - Modern Gem Jewelry
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1.63 Carats Natural Fire Opal Oval Shape | 6.8mm x 4.3mm
$120.00
2.6 Carats Natural Fire Opal Gemstone Triangular 11.82mm x 11 x 4.9mm - Modern Gem Jewelry 2.6 Carats Natural Fire Opal Gemstone Triangular 11.82mm x 11 x 4.9mm - Modern Gem Jewelry
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2.6 Carats Natural Fire Opal Gemstone | 11.82mm x 11 x 4.9mm
$189.00
Attractive & Stricking 3.48 Carats Fine Natural Fire Opal  Loose Gemstone - Modern Gem Jewelry Attractive & Stricking 3.48 Carats Fine Natural Fire Opal  Loose Gemstone - Modern Gem Jewelry
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3.48 Carats Natural Fire Opal Gemstone
$150.00
Huge Amazing Color Play 15.69 Carats Ethiopian Natural Opal - Modern Gem Jewelry Huge Amazing Color Play 15.69 Carats Ethiopian Natural Opal - Modern Gem Jewelry
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Massive 15.69 Carats Ethiopian Natural Opal Gemstone
$480.00
4.2 Carats, Rich Pink Ethiopian Natural Opal Oval  5.22mm x 5.43mm - Modern Gem Jewelry 4.2 Carats, Rich Pink Ethiopian Natural Opal Oval  5.22mm x 5.43mm - Modern Gem Jewelry
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4.2 Carats Pink Natural Opal Oval | 5.22mm x 5.43mm
$140.00
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