There are some gemstones that look similar but completely different in jewelry. For example, ruby and red diamond. How to distinguish which of these two stones is in front of you? The red diamond is a product of nature made up of carbon. It is very rare and its unique crystal arrangement makes it the hardest substance in the world. It is very hard to find a diamond with a strong red color. Sometimes the color of the gem appears with the help of a human hand: the color was enhanced with heat or pressure treatment, meaning it’s been irradiated....