There are many things to compare between ruby and diamond because they are two extremely different types of materials. To name a few: Corundum, a type of mineral made of aluminium oxide, is what ruby is made of. On the other hand, diamond is a totally pure form of carbon. Rubies often have a red colour, whereas diamonds typically have a clear or white colour. However, depending on the existence of trace elements, diamonds can also appear in various colours like yellow, pink, blue, and green. Hardness: Diamond, which rates a 10 on the Mohs scale of hardness, is the hardest naturally occurring substance. One of the hardest gemstones is ruby, which has a hardness of 9 on the same scale. Value: Although it might vary depending on size, colour, clarity, and cut, diamonds are often more expensive than rubies. Diamonds are typically employed in jewellery because of their value as durable, brilliant gemstones. Rubies are employed in lasers as well as jewellery because the corundum's chr