Rare, unusual and unique, this Black Opal Sterling Silver Pendant Necklace, with it's superb quality electric blue/ black opal stones, is the perfect gift for October birthdays! Black Opals are a highly regarded gemstone and are coveted for their rare and unusual electric colour-play! Each stone is a natural wonder formed entirely by mother nature, and can contain a multitude of colours from blues to greens and oranges to reds, meaning the piece you receive is totally unique in size, shape and colour! Otis Jaxon London Women's Black Opal Sterling Silver October Birthstone Pendant Necklace in Gold