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Josh K.For some reason I couldnt actually respond to your message. Anyway, here is psa's grading standard for a gem mint 10 (75/25 centering on the back).
GEM-MT 10: Gem Mint.
A PSA Gem Mint 10 card is a virtually perfect card. Attributes include four perfectly sharp corners, sharp focus and full original gloss. A PSA Gem Mint 10 card must be free of staining of any kind, but an allowance may be made for a slight printing imperfection, if it doesn't impair the overall appeal of the card. The image must be centered on the card within a tolerance not to exceed approximately 55/45 to 60/40 percent on the front, and 75/25 percent on the reverse.