Sometime tomorrow for Black Friday, I am setting a sell sign that sells a stack of diamonds at 45r each almost 20% off the average price (55r). So come on down to 18646 on SMP9 and walk straight to buy up to a stack of diamonds, dont miss it, on Black Friday. Happy Black Friday! I'll post when I set up the sign.
He means that there is a stack of diamonds for sale, and he is selling each individual diamond for 45r, not the whole stack. 1 diamond is on average 50-55r, depending on the server.