Antique Victorian 10k Yellow Gold OPAL Stick Pin. I am not sure what type of opal stone this is. It is not the typical opal I'm used to seeing. This one is an orangish pink color with amazing fire ~ opalescence in shimmering greens, pinks and orange shades. The pin measures 2 7/8" long. The stone is approx 9mm and about 6mm thick. Pin weighs 2.1g total weight. Tested 10k. Excellent condition. Some wear to pin tip.