Quartz crystals showing a grayish to black hue, caused by naturally occurring radiation are known as smoky quartz. Shades of brownish or even a yellowy citrine-like hue are also known from certain localities. Natural Himalayan Smoky quartz is extremely rare. Much of the smoky quartz on the market today, has been synthetically irradiated to alter its natural hue and it is quite difficult to detect the authenticity without proper equipment. All smoky quartz crystals and specimens offered at Himalayan Clarity have been carefully extracted by us or our friends and are guaranteed natural color and form.