There's probably no need to introduce diamond, one of the most prized gem these days and is also considered as a girl's best friend. Apart from its striking beauty, diamond is also known for its incomparable toughness. In fact, the gem's structure makes it fifty-eight times harder compared to anything that can be found in nature. Also, the gem can only be cut using another diamond.
Although the most common type is the colorless one, diamond actually comes in numerous color including red, pink, green, yellow and blue. However, the gem with intense color is actually rare, making them more pricey compared to its colorless counterparts.