I believe theres a filter on dstone trading, as just 2 days ago i was trying to Xfare 1m onto pure, But after i bought 8-10 dstones, i got a messege saying "you cannot buy any of these right now!"..
FAIL?
youll need to transfare rest through bh.. I'll buy it through bh, its like 2 saradomin sets + 10 d stones. PM me if your interested