Opals come in a variety of colors, with shades of white,
greens, and blues the most common. The rarest is red against black.
Australia produces 97% of the world's opals, but the gemstone has also been mined in the United States
(Nevada and Idaho). Synthetic opals, developed in 1974, are beautiful but do not
contain the fluorescence of their natural counterparts. or below for your
selection of womens opal rings.