This fire opal weighs a spectacular 132 carats. Courtesy W. Constantin Wild & Co., Idar-Oberstein, Germany
"The Path of Enlightenment" necklace contains 180 magnificent opals from Lightning Ridge, Australia, a famous opal producing area. - Courtesy Cody Opal
This fine-quality light opal is from Mintabie, South Australia. Almost all of its spectral colors are visible from a variety of viewing angles. - Courtesy Cody Opal
This exceptional light opal is from South Australia’s Coober Pedy opal fields. - Courtesy Cody Opal
The rough specimen is a thin seam of boulder opal on sandstone host rock. The 3.47-carat boulder opal tablet was cut from a similar piece of rough.
This black opal exhibits exceptional play-of-color. - Courtesy Cody Opal
With proper care, opal jewelry will provide years of enjoyment. - Courtesy Cody Opal
Figure 3. Raman spectra of untreated, oil-treated, and Opticon-treated opal. The oil-treated opal shows characteristic Raman peaks at 2929, 2897, 2873, 2851, and 2724 cm–1. The Opticon-treated opal displays characteristic Raman peaks at 3071, 2931, and 2873 cm–1, with a series of smaller peaks in the 600–1600 cm–1 range.
Figure 2. FTIR spectra of untreated, oil-treated, and Opticon-treated opal. The two treated opals show characteristic FTIR peaks in the 5600–5900 cm–1 range, while untreated opal does not show any peaks in this range.
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