Iolite, more commonly known as cordierite in mineralogy, tends to be found along with metamorphic rock and granite veins. Lab-grown iolite is most commonly used in ceramics for catalytic converters, while gem-grade iolite is sometimes used as a substitute for sapphire due to its similar color.
Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.