Olympic Australis

Record: The Largest And Most Valuable Opal In 1956, the largest and most valuable opal in the world was found at the Eight-Mile opal field, in the mining town of Coober Pedy in South Australia. It was discovered at a depth of 9.144 meters (29 feet,) and was named the Olympic Australis opal, due to the Olympic […]

American Golden Topaz

Record: The Largest-Cut Yellow Topaz In The World The American Golden Topaz currently holds the record for the largest piece of cut yellow topaz in the world.  More importantly, it is one of the largest faceted gems of any kind.  It is sized at 22,892 carats (4.5785 kg) and has 172-facets (flat-faced cuts applied to […]

Graff Pink Diamond

Record: The Most Expensive Gem Ever Sold At Auction Some of the most valuable gems in the world are colored diamonds that have been graded (D) and flawless. One such diamond was discovered in the 1950s, when American jeweler Harry Winston purchased a rare pink diamond from an unknown collector.  The diamond was 24.78 carats in size, […]