Diamond, the birthstone of April. The word diamond is derived from the greek word ‘adamas’ meaning invincible. This being quite appropriate considering diamonds are the hardest material on earth, 58 times harder than anything else in nature. Diamonds are found in many different colours, these can include Yellows, reds, pinks, blues and greens. Diamonds that we are most used to seeing tend to be those of a colourless variety. A diamond is thought to bring its wearer abundance, clarity and balance. It is also given as a symbol of eternal love.