SIZE ADJUSTABLE RING: Suitable to all Men having ring sizes between 15 to 28. Emerald is a variety of the mineral beryl colored green by trace amounts of chromium and sometimes vanadium. Emerald Gemstone (Panna Stone) is considered most precious gemstone. Source of Emerald stone is Colombia and Zambia, Brazil, South Africa, Zimbabwe, Russia, and Afghanistan. As per Vedic Astrology, the healing properties of the Panna stone are associated with the planet Mercury (Buddh). Emerald gemstone is associated with zodiac signs Gemini and Virgo. Emerald gemstone helps in increasing concentration, reducing depression and problems of the heart. Sportsmen and creative people like writers, painters, and sculptors.