Hey I'm posting this for a friend. He is selling 4 stacks of Quartz blocks, and is asking for only 3 stacks of Diamonds for them. This is a good deal as Quartz blocks usually sell for 1 dia each. /msg BlackNeko14 if you're interested in trading with him.
To be honest, quartz should be worth about 4 quartz per diamond... But no one really buys it- there for it is impossibru to sell. I'll however make an offer you'll probably deny. 20 diamonds.