October birthstone! Segments of natural Ethiopian Opal rondelle beads with strong rainbow flash separated by Green Onyx beads, followed by segments of Green Onyx beads separated by 3mm bicone 14KGF beads. All Green Onyx beads are 3.5mm, faceted, and semi-translucent. The Opals range from 5mm to 9mm diameter. The rainbow flash is hard to photograph, but you can see it in the close-up photos. The Onyx can also be considered as the secondary birthstone for the month of July. 3mm 14KGF bicone beads lead to an ornate 14KGF magnetic clasp accented with 1mm round CZ stones. SPECIFICATIONS • Necklace weight: 16.2 grams (0.6oz) • Size: 16 3/4" • Metals: 14K Gold Filled • Main beads: Ethiopian Opal, Green Onyx