Diamond, one of the highest prized gemstones, is the official birthstone of April. It is also used for the 60th & 75th anniversary.
Diamond is prized for both its prismatic beauty and its hardness. It is the hardest mineral on earth. The largest diamond know, however, is not on earth, but rather from a white dwarf star named "Lucy". It is approximately 10 billion trillion trillion carats. On earth however, the largest diamond, weighing in at 545 carats is the Golden Jubilee Diamond.
Diamonds were once believed to cure illnesses if you took it to bed with you. While diamond is not as old as some other types of gemstones, it quickly became one of the most valuable gemstones in jewelry. Diamonds are now used in many different ways besides jewelry. This includes use as an abrasive, a heat sink, engraving and even as a speaker dome.
Mineral Group: Diamond
Refractive Index: 2.42
Specific Gravity: 3.52 (+/-0.01)
Mohs Hardness: 10