Coral's earliest known use in jewelry dates back 30,000 years. Coral is soft compared to most gems. All corals require certain environmental conditions for growth. The water must be fairly calm, it must be within the right temperature range, and it must be free of pollutants and suspended mud. These conditions only exist in a few geographical areas. In Vedic Astrology, Red Coral is worn for planet Mars. It imparts courage and helps in overcoming fear and nervousness in the individual. • Group: Coral(Calcareous) • Refractive index: 1.486-1.658 • Birefringence: 0.172 • Specific gravity: 2.70/ +0.05, -0.5 • Crystal system: AGG • Hardness: 3.5-4 • Origin: Italy Please note that natural red coral is an organic gemstone, and as such, small surface pits, faint growth lines, and minor internal fissures are completely normal. These unique inclusions are not defects; rather, they are the "birthmarks" of nature that serve as a hallmark of authenticity, proving your gemstone was formed over years in the deep sea and is not a synthetic or plastic imitation. Embracing these subtle, organic characteristics ensures you are wearing a genuine piece of earth’s history, each with its own distinct character and natural beauty.