Round 3mm, 29 pieces garnet and round 1mm, 10 pieces white topaz. Other stones can be used such as: amethyst, garnet, citrine, sky blue topaz, peridot, rainbow moonstone labadrorite, black spinel, milky aquamarine, carnelian, white quartz, etc,. All jewellery is rhodium plated, nickel free, and 925 stamped.