Other resources

• The many colors of opal and my opal earrings
  Many people like to wear birthstone pieces on a daily basis and opal does not stand up to that kind or wear. There are many colors of opal in addition to the traditional milky stone.
  Read more: Opal earrings
• Diamond durability
  Diamonds are among the hardest substances on earth; in fact they use diamonds and diamond dust to cut diamonds.
  Read more: Diamond durability