A grand mid-century Mexican fire opal cocktail ring. The 12.60-carat mandarin jelly opal displays an astonishing play of color and is well proportioned. Yes, it's bold and somewhat over the top; as it was meant to be back in the 70's. Set in its original 18 karat white gold setting, adorned with nearly 2 carats of sparkling marquise and round diamonds in an asymmetrical array.

The Mexican fire opal was known to the Aztecs and was used by the Mayans for ritualistic purposes and in various mosaics. Even today, many connoisseurs believe that fire opals bestow courage, stamina, and energy to the wearer due to their warm, fiery orange-red colors. Xiuhtecuhtli was the God of Fire & Volcanoes, so it's fitting that Mexico's national gem is opal.

Above paragraph courtesy of Bonhams.