The moon-like luster of this gemstone is built during its extraordinary formation. Over time and throughout development, the minerals orthoclase and albite are alternated in layers. Due to this structure, light scatters when it enters the surface of the stone. A mysterious glow appears, which is called the phenomena of adularescence. This not only separates it, unmistakably, from counterfeits but is the reason for its popularity. The color variations are great and seem soft. At Bron, we select mostly cabochon moonstones in white, grey, peach and brown.
Colors: white, grey, peach and brown
Where to dig for it: India, Sri Lanka, Tanzania and Zambia
Mohs hardness: 6 - 6.5
The Mohs hardness scale
The Mohs hardness scale describes a scale from 1 to 10, which indicates the relative hardness of a mineral. Diamond is the hardest substance in the world and is therefore rated with the highest hardness grade of 10. To further illustrate the Moh's hardness it helps to imagine that a moonstone
(hardness 6) is about as hard as the blade of a kitchen knife. A fingernail would only measure a grade of 2-2.5 on the scale.
At Bron, the hardness plays a minor role. Our overriding selection criteria are color and the ‘liveliness’ of a gemstone.