An Image of Gray

[churinga]

- or, through a silvered looking-glass, our own -
An echo of 'through the looking glass.'  

perhaps a twist of cruelty edging its aging lips,
edging aging lips, you seem to have 'its' for the meter, 

or, instead, just a diamond slab
I associate slab with marble, not diamonds.  Also diamonds are cut not chiseled.

All the best

Ross