Auction introduction: Throughout history, large diamonds offered at auction have never failed to captivate an audience and elicit a sense of excitement and awe. The Key 10138 weighs 101.38 carats and has been graded by GIA as D Colour, Flawless, and Type IIa. There are only a small number of faceted diamonds that weigh over 100 carats throughout history and it is rarer to find such a diamond with perfect colour and clarity. Type IIa diamonds are themselves very rare as they contain no IR-detectable nitrogen or boron impurities in their chemical structure and represent less than 2% of all diamonds mined. Considered the most chemically pure diamonds, they tend to display exceptional transparency. The Key 10138 is the first important diamond in the world to be auctioned with cryptocurrency as an accepted method of payment. It was named to symbolise the unlocking of a new era in commerce and technology, and thus is a key to history. The Key 10138 will undoubtedly become a diamond that history remembers as it takes the culmination of humanity’s work and knowledge on diamonds thus far, and turns the key to unlock a still more brilliant future.