Glorious 36ct Tanzanite quartz ring with a great blue-violet hue offset by one sparkling faceted white sapphire on each side and set in sterling silver. Tanzanite quartz may be similar to tanzanite in appearance, but it is not the same gemstone. Tanzanite quartz is either clear quartz treated to look like tanzanite--a violet-blue, expensive and rare gemstone--or quartz with a natural color similar to tanzanite's. It is still a magnificent and quite expensive stone at this size and clarity. Size 8.75 can be sized by a good jeweler.