These stones come in varying degrees of blues & greens and are associated with the heart and throat chakras. Good stone for those who teach or speak in public and can also help you lower stress and tension levels when carried regularly. Physically they help the body regerate after illness and help support the thyroid, larnyx, adrenals and heart. In some cultures they are considered a good luck stone, especially when gambling.  Our current stock is around an inch round in size with more greens than blues