Black Onyx Tumbled Stones, Polished Natural Black Onyx Gemstone, Black Onyx Polished Rocks, Grade A Quality Size: 0.75" - 1.25" approx. You're expecting 35-42 stones per lb on average. As the item size varies so the amount per 1 lb will vary from batch to batch. But it will be +/-. This is a guide only and orders may fall outside this guide as we sell this item by weight Stones used in reiki, healing, meditation and crystal healing. Great for therapy, grid work, and to carry in your pocket or pouch Shapes, sizes, colors, and patterns of Black Onyx tumbled stone may vary as it is a natural stone Black Onyx Stone in Spiritual healing strengthens focus and willpower. Black onyx can be used for grounding, protection, and self-control, and as a shield against negative energy. It also enhances discipline, allowing more ease in following through on goals and completing tasks.