Sunstone has an alias, "heliolite," which comes from the Greek word for "sun." Especially in ancient Greece, where sun worship was prevalent, it was revered as a symbol of the sun god. The sun is a great power that has provided blessings since ancient times and continues to do so today. Authenticity guaranteed, only one available. High quality, different from low-priced items. Inner circumference: Approximately 16cm ± 1cm Material: Sunstone (from America) Bead size: 7mm Free shipping. Thank you very much.