Diamond is the birthstone for those lucky enough to be born in April. They are recognized as the stone of eternal love. In its rarity and beauty, is a symbol of purity and innocence, of love and fidelity, and embraces strength of character, ethics, and faithfulness to oneself and others. Diamond comes from the Greek word meaning "unbreakable" since diamonds are the hardest naturally occurring material on earth. Today, diamonds are the most highly valued and sought after gemstone. The quality of the diamond is determined by a standardized grading scale known as the 4C's: cut, color, clarity, and carat. The most important of the 4Cs is cut because it has the greatest influence on a diamond's sparkle. The second most important of the 4Cs is color, which refers to a diamond's lack of color. The less color, the higher the grade. Often the least important of the 4Cs is clarity because the tiny imperfections are often microscopic. Finally, the term carat actually refers to the diamond's total weight and not its size. The overall weight of the diamond or carat is another important factor in determining the quality of a diamond.