cts. Or 5.5 grams. That's about the weight of a small ballpoint pen, or about as heavy as a large apple. The sapphire is the only gem that is completely transparent; it has no inclusions of any kind. Sapphire was formerly used for glass production and still is in some parts of the world. Pure sapphire is now rare but comes in various colors, including blue, green, red, and orange. The color of sapphires is derived from the type of mineral inside them. They are usually white, pink, or yellow, but blues, purples, and greens can also be found. The more vivid the color, the higher the quality. Sapphires are one of the most durable gems in use today. It will not crack or break down with time. Used sapphires are popular jewelry items. They add value to your jewelry collection by just wearing it! There are several varieties of sapphires.