Artisan Iolite Ring Sterling Silver Filigree Setting. This pretty ring features a natural Iolite gemstone. Iolite is also known as Water Sapphire. The correct color for an Iolite is an inky purple blue and this ring is the correct color. The ring measures 3/8 inches across. The Iolite is flush against the top of the setting and weighs in at 1.25 carats. This ring is a US Ladies size 6.75 and can be resized by your local jeweler. This filigree Iolite ring is in very good condition.