10k gold A karat marking followed by 'P' indicates that the piece is plumb, meaning the purity is exact. For example, '10KP' is exactly 41.7% gold. Federal law allows the stamp to deviate . 5 karats from the exact purity, so a '10K' stamp could be as low as 9.5 karats, but the plumb stamp guarantees the exact 41.7%. Jade is such a gorgeous color! The stones on the sides are not diamonds, not sure what they are but they tested softer than diamond.