I am currently charging 10M for 4 gem bracer and 15M for pair of them.
People seem to be paying that quite happily. Only once when person who had bracers ready but no gems inserted said that it takes only few seconds of my time. But when I told I don't charge for time but for 1755 EE and 16xx MM he paid 15M for inserting gems.
How much others are currently charging on rk2? Specially clan side. I might bring my prices up if others are charging more.