This listing is for 1 ring, to add multiple rings, add them to your cart 1 at a time. Chose your size & months Birthstone from the drop down menu, click Add To Cart, then start over for your next ring & Add to Cart again. Design your own personalized stacking ring set! The possibilities are endless! Have a look at all my rings & add on an initial ring! Rings made from Stainless Steel which is non tarnish, waterproof, & hypo allergenic. The stone measures 4mm across, & 5mm with the bezel. See the “Ring” Section on my shops main page for all available Ring Stacks Gold Birthstone Gem Ring, Stacking Rings