Nor might of mortal eye be ever seen > [No mortal eye might ever look upon it]
3 Not made of steel, nor of enduring brass 4 (Such earthly metals soon consumed been):
been > [would have been]
5 But all of diamond perfect pure and clean
clean > unpatterned, unadorned
6 It framed was, one massy entire mould,
framed > fashioned, made massy > solid, weighty entire > [in one piece] mould > shape
7 Hewn out of adamant rock with engines keen,
adamant rock > diamond engines > tools, machines keen > sharp
8 That point of spear it never pierce could,