Iloite Sunstone

A wonderful deep blue iolite with silvery rainbows of "meteors" flashing through it as it moves in the light! I hand cut this elongated teardrop shaped piece which measures 51x17mm, is 8mm thick with a 2.5mm drill hole and has a weight of 54cts. It has a polished finish all over. The stone is cut so that the orientation of the optical phenomena are at their maximum. Still images don't do this amazing and hard to find gemstone justice. The stone really has to be moved around in the light to get the full optical effects of the aventurescence, chatoyancy, and iris effect that are all present in this remarkable stone!
This material is called "Bloodshot Iolite". It is an odd variety of iolite, a magnesium aluminum silicate, that has inclusions of small flat platelets of reddish hematite or goethite. This creates the optical phenomena of adventurescence throughout the stone. It is the same mineral and optical effect found in feldspars that are sunstones, so this is also accurately referred to as "sunstone in iolite". Iolite is noted for it's pleasing blue color and is often mistaken for sapphire or tanzanite, which are both much more expensive. Most iolite has inclusions and in these stones that I have cut the internal inclusions also create "iris effect" which are little refracted rainbows within the stone. I have never seen ANY of this rough available before my last trip to the World's gem & mineral trade shows in Tucson this last February. I saw ONE dealer who had this rough and I bought his 8 nicest pieces, which yielded only about a dozen pieces and I only have 4 left in my eBay store. That is all I have EVER seen of the rough and if you look around you won't find any other loose beads or custom cut cabs out of this material.