Australian Opal Butterfly Brooch, Blue Opal Butterfly Brooch Pin and Pendant. The gemstones on this brooch pink are natural Australian Opals and measure 3x4mm. The side stone oaths brooch are high quality cubic zirconia's. This pin is 925 sterling silver and available in three color options: Gold Color, Rose Gold Color, or Silver (Platinum Plated). This item includes a gift box and a certificate of authenticity with purchase. Please allow up to 10-15 days for processing and delivery of this item.