They are often confused with Tanzanites due to their blue-violet hue. Fine Iolites are naturally vibrant and do not need treatment. They are usually transparent and generally contain a few inclusions. The beautiful blue-violet shade is due to the presence of iron.
Although these gemstones are reasonably hard stones, extra care is essential, and preventing hard knocks is a must. Iolites are not tolerant to high temperatures. Avoid steamers and ultrasonics when cleaning. Use warm soapy water and a cloth to clean any jewelry with Iolites.