This moonstone cushion sugarloaf cabochon presents an ethereally transparent, watery milk-white color and the signature adularescence moonstone is known for. One of the most intriguing and desirable cabochon styles, sugarloaf cabs are cut to have a rounded, pyramid-like upper surface instead of the typical domed profile; the edges of the pyramid are rounded rather than being sharply angled. In this stone, the base is four-sided, like a cushion-cut stone. Consider setting this stone with a dark or black underlay, or in a highly oxidized setting; a dark background will effectively bring out its glow. Moonstone is a member of the feldspar-group mineral orthoclase and features an iridescent sheen called "adularescence." Some believe that, to be correctly called moonstone, the makeup of a given stone is less crucial than the presence of the characteristic adularescence. In true moonstone, however, this characteristic is due to the presence of albite inclusions within the stone and the reflection of light from the crystalline structure. Ancient Romans believed moonstone to be rays of moonlight transformed into a solid form. Specifications: Cutting Center : India Mineral source : Tanzania Stone size : 5mm Stone(s) shape : Cushion Material : Moonstone Stone type : Natural Color : Milky White Clarity : Translucent Mohs hardness : 6¨C6.5 Refractive index : 1.518¨C1.526 Enhancement : None (N) Specific gravity (g/cm3) : 2.55¨C2.76 Please Note: ? Care: Clean with warm, soapy water; never clean using steam or ultrasonics. ? This stone is suitable for firing in place in silver PMC3 using the schedule with the lowest-temperature settings.