Personalize your style with birthstone stackables Gabriel & Co. Birthstone Stackable Rings offer a way to celebrate your story with the stones that mean the most to you. Choose your birthstone and stack multiple rings for a look that is uniquely yours. Important Information Please select your finger size using the chart below before purchasing. This is a special order item and requires 4-6 weeks for delivery after the order is placed. We will contact you once the item arrives in store. Create a personal and meaningful collection that reflects your journey.