This is a genuine and natural opal. You might see dazzling flashes of blues or greens. Or you might see a clear opal gemstone. Opals look different under various lights and at various angles, so this pendant has been photographed under various lights and at various angles. This is a natural opal. It is from the earth. This is a solid opal, not a doublet, or a triplet. The weight of this gemstone is 2.56 carats. It is oval shape and measures about 11 x 9 mm. There are 25.4 mm to 1 inch, please see pencil for size comparison. I have hand set this gem into this solid .925 sterling pendant that is marked STERLING on the back. The pendant you see in the photos is the pendant you will receive. inventory #4769. FREE SHIPPING First Class US Mail. Usually I send items out in less than 24 hours. FREE gift box. FREE gift wrap.