Tumblestone - Agate, Crazy Lace A single tumblestone measuring approximately 15mm - 25mm in size. £1.00 Quantity: at £1.00 each Add To Basket 0 in your basket View Basket Checkout Stone of support and encouragement promotes optimism, creates a circular flow for energy stimulating the mind and attitude. Helps to overcome fear of spiders and crawling insects. Stimulates the digestive system. Helps heal insect bites.