Over 06 weight: 34.2 carats. Size: 29 x 20 x 5.8 mm. Koroit Matrix Opal. Superb pattern here on the front; the back has more pits than a bag of olives. Can you see the gentleman's face, looking right, in the top righthand quadrant? He's got a white feather in his hat. Some say he is wearing a cloak & carrying a saxaphone.