Diamond, the birthstone for April, is a precious gemstone and the most popular of all. A diamond is a mineral compound made of pure carbon and is the hardest natural substance on the planet. Going back to early history, diamonds were used to engrave tools and gemstones because of their hardness. Warriors in ancient Greece wore diamonds as the stones were thought to strengthen the warriors’ muscles and bring them invincibility. Diamonds have been believed to improve one’s energy, environment, growth process, prosperity, love life, faith and endurance.