Brock's Onix #21 PSA 10: price & population
PSA 10
$210.74
Raw
$8.50
PSA 10 pop
22
Gem rate
17.7%
A PSA 10 Brock's Onix #21 from Gym Heroes sells for $210.74 — a 2,379% premium over the $8.50 raw price. PSA has graded this card 124 times; 22 came back a 10 (17.7% gem rate), and 44 a PSA 9.
The 9-to-10 spread
PSA 9 sells for $22.12. The jump from 9 to 10 is worth $188.62 — that spread, times your real odds of the 10, is what decides whether grading pays.
Prices from real completed sales, updated daily. Population data from PSA's public population report.
