12.5 & 7.5 mm Blue Chalcedony 6mm blue & yellowTopaz Crystal (Blue Chalcedony, Lung Chakras, a creative & peaceful stone, open the mind with enthusiasm to new ideas and new horizon, imparts mental flexibility & verbal dexterity, improves self-perception. Enhances the immune system and stimulates the lymph glands. Yellow Topaz, empathetic stone, directs energy to where it is needed most. It smmthes, heals, stimulates, recharges, motivates and aligns the meridians of the body. Brings you joy, generosity, abundance and good health.)