Stackable Sterling Silver Birthstone Rings Featuring 7 round brillant cut garnets, amethyst, synthetic aquamarine, white topaz, synthetic emeralds, synthetic alexandrite,synthetic rubies, peridot,synthetic sapphires, synthetic opals, synthetic citrine, and blue topaz. Available sizes of 6, 7 and 8. All in Stock sizes are 7 and all others would be a special order. 1 of each month.