Are you ready for a treasure hunt? Let's see what other people find while mining for some inspiration. Tanzanite is a stone that's more valuable and expensive than diamonds, which became popular after Tiffany and Co. began to use it in their jewelry. You can only come across red beryl on a mountain in Utah. "Virgin Rainbow" opal is valued at $1 million and was discovered in 2003 inside an ancient cuttlefish skeleton. Learn more about your ad choices. Visit megaphone.fm/adchoices