Large Fiery Natural Australian Boulder Opal Pendant in 14kt Gold with Articulated Clasp

Vintage Australian Boulder Opal pendant with an opening, articulated clasp for easy on-off fastening (note: fits well on herringbone chains). The pendant measures roughly 1.5 inches in length x .5 inches (opal itself is roughly 25mm x 12mm). Gold is 14kt-stamped, total weight: 4.35 grams.