Ross-Simons - Ethiopian Opal Earrings, .29ct t. w. Diamonds, .20ct t. w. Emeralds. Fanciful 7x9mm oval Ethiopian opal cabochons glimmer from elegant marquise-shaped settings, adorned with .29 ct. t. w. round brilliant-cut diamonds and rich color from .20 ct. t. w. marquise emeralds. Set in polished 14kt yellow gold. Post/clutch, diamond, emerald and opal earrings. Opal birthstones are the perfect gift for October birthdays.