This came out of a conversation on Twitter

MOONSTONE

Hearts meet and part. Worn by the constant flow,
waves friction, weakness shows up in the grain
each bruise, each contact, momentary pain,
lasting depressions that will slowly grow

and tiny irritations lodge within
and rub against each other in their turn.
Tides rise and fall, ebb peak. A chinese burn
twisting and turning, slowly leaving skin

stinging with pleasure-pain. At last a hole
so neatly circular as if a drill
had made it. And the hurt will never kill
but leave its mark forever in my soul

You thread me where you hurt me, and will wear
my heart and others round neck, in your hair.