The highest graded Pikachu Illustrator card is a PSA 10, which sold for a record-breaking $5.275 million in 2021. This particular card is the only Pikachu Illustrator to have ever received the top-tier PSA 10 "Gem Mint" grade. 

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• Grading: The card received a perfect PSA 10 grade, making it one of the most pristine copies in existence.

• Sale: It was sold in a private sale in July 2021 and holds the Guinness World Record for the most expensive Pokémon card ever sold.

• Condition: A PSA 10 signifies that the card is virtually perfect, with sharp corners and full original gloss.

• Other high grades: Before this card's record-breaking sale, other high-grade Pikachu Illustrator cards still sold for significant amounts, such as a PSA 9 that sold for approximately $1.1 million in 2021.