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Posted By: Mr.Charlie

To some extent, I think it depends on how many 9s there are, but I would guess an 8.5 would bring close to 50% more than an 8. If there was only one or two 9s, it might bring more. These are just guesses since the market for these half grades is so new in PSA circles. Generally, I think SGC 8.5s bring about 50% premium over 8s.
JimB