For buyers without an indepth knowledge of gemstones, iolite would seem to be quite similar to tanzanite and many people infact mistake iolite for tanzanite. Iolite stones are a gorgeous bluish violet color and lighter shades of iolite look similar to tanzanite. However, iolite is not tanzanite and has a beauty of it's own.
Gem quality iolite stones are not exactly cheap but they are priced much lower as compared to tanzanite gems. Here are a few important features and facts about the iolite gem stone.
(a) The iolite gemstone is quite durable and strong. It has a hardness 7 to 7.5 on the Moh's scale of hardness. This makes the iolite stone very suited for jewelry making. As far as durability of the gemstone is concerned, iolite is more durable than tanzanite.
(b) Iolite exhibits an important property called 'pleochroism'. You can observe this if you hold an iolite gem stone and view it from different sides. You will see different colors from different angles. From one side the iolite gemstone will look a rich bluish violet color and from the opposite side it could appear pale and almost colorless! As interesting as this phenomenon can be, it poses big hurdles for gemstone cutters. This is because the iolite stone needs to be cut at the perfect angle so that it shows it's best color from the top. This is the reason why only skilled craftsmen can bring the best out of an iolite gemstone.
(c) It is not very hard to find gem quality iolite stones in large sizes that can go up to 4 or 5 carats per piece. However these large iolite gemstones are getting to be rarer as demand increases. The rising prices of tanzanite is one reason for iolite gems getting to be expensive too.
(d) There is an interesting fact about iolite stones and that concerns the price of the gemstone. We already - continued below ...
