Scarlet Scars

Engraved within my chest's a ruby beating, An image of my precious wondrous rare; I mined it from a sanguine vein retreating, A carcanet arcane of grading fair. Its lustrous tone bleeds lusty pigeon's blood; Inclusions nil, my closet gem's most clear; My stone's an unrefined and uncut stud, A carbuncle inflamed of rating dear. This payment fine accounts a carmine fool: I rent my heart to lease a costly rock, A tarnished shape for varnished casket's jewel, A carnifex encased of trading stock. I've paid my chest to get a carnal treat; I've graved my casket, earned a carcass beat.