18K yellow gold slide pendant featuring a very fine boulder opal with vibrant blue and green play-of-color bezel set in center of slide with full-cut diamonds bead set in frame around opal along with double row hammered finish frame, double oval loops on back, 1.25 in W x 1.75 in. L, hanging on 14K yellow gold flat Omega necklace measuring 8 mm W, hidden box clasp with safety latch, 75.1 grams tw (22.3 grams of 18K and 52.8 grams of 14K)

Comments added on 5/3/2022: The length of the omega necklace is approximately 15 inches long