The Birthstone Stacker is a simple three prong ring design with a 1mm wire and 2mm round brilliant birthstone. The Birthstone Stacker ring gives you an easy way to stack your birthstone, your child's birthstone, an anniversary stone, or just a pretty colored stone that you love along with your other favorite CTWF pieces. Add a meaningful splash of color to your stack and be reminded of something or someone special every time you glance at your finger!