Jewel Royale Chess Set - The world’s most expensive chess set is valued at over 9.8 Million Dollars. It was created in Great Britain and commisioned by the Royale Jewel Company. What makes this the most expensive chess set in the world? Well… its made of gold and platinum, it has diamonds, emeralds, rubies, pearls and sapphires. The king piece weighs 165.2 grams of 18 carat yellow gold and has a spiraling mid-section graced by 73 rubies and 146 diamonds.