This is a gorgeous high quality smokey quartz geometric shape in the form of a dodecahedron. It has tons of rainbows and is truly a collector's piece. The measurements are roughly 3" across in diameter. Please keep in mind that crystals have natural imperfections, and polished crystals such as this also are not perfect. I always point out if there are true flaws that have developed after I purchased the item. I have many crystals listed, and you can bundle multiple for a better price. I am open to considering all reasonable offers.