Ross-Simons - Floating Opal Pendant Necklace in 14kt Yellow Gold. 18". Like a full moon suspended in the sky, this delicate floating opal necklace is just heavenly. Shimmery pieces of free-form opal float and flicker inside a 10mm round clear handblown glass bulb-shaped pendant, crowned in 14kt yellow gold. Suspends from a rope chain with springring clasp. Floating opal pendant necklace. Opal birthstones are the perfect gift for October birthdays.