ABOUT 60MM BY 35MM.AUSTRALIAN SOLID BLACK OPAL MATRIX WITH BEAUTIFUL COLOUR SPECKS THROUGHOUT.THE FLASHES OF VARIOUS COLOURS CAN TRULY BE APPRECIATED WHEN THE SUNLIGHT HITS ON THEM DIRECTLY AND..wow.! THESE GEMS HAVE ALL THE BRIGHT COLOURS OF THE RAINBOW.THEY ARE GETING HARDER TO FIND IN THIS QUALITY.
