Moonstone is easily recognised by its characteristic sheen, which appears under the surface of the gemstone to create an effect comparable to moonlight. This Milky Moonstone cabochon has a beautiful blue sheen colour known as 'adularescence;', visible within the gemstone. This Round Cabochon measures 5mm in diameter. Moonstone has a hardness of 6 on the Mohs scale. Please note that, due to the nature of the stone, each cabochon may vary slightly. It is not advised to place moonstone in an ultrasonic, steam cleaner or chemical cleaning solution. Clean with warm, soapy water or an untreated cloth. Please note, a slight tolerance of +/- 0.25mm should be expected with these stones.