a rich somewhat violet-blue is preferred, a colour which may appear violet-blue in daylight and purplish-blue under tungsten light. This colour is especially characteristic of the finest Burmese stones. Kashmir stones have a velvety appearance and despite colour zoning are highly valued. Pale violet-blue stones are characteristic of many Sri Lanka sapphires. Australia also produces fine blue stones, although they are also renowned for producing inky (virtually black) specimens. Learn more on YouTube