Sonora "Twilight" tri-color cabochon cut out of the original material from the Milpillas Mine in Sonora Mexico. With a more subdued grey-green and maroon red, I thought a re-christening from Sunrise to Twilight was appropriate. Hand cut and polished in our shop. Domed top and smooth flat back for a bezel setting. Size 32 x 17 x 5.28 mm A dime is used to reference size Measurements (other than thickness) are rounded down to the nearest mm No filters or special lighting is used, however not all monitors display color the same We guarantee the cab looks better in hand We are happy to combine items to save on shipping cost.