diamond stud 

A butch lesbian that sparkles.

Shirt and tie, and eyeliner sharp enough to kill a man. She's a diamond stud.

diamond stud by Woodward Diva December 14, 2016

Diamond-studded cactus 

An item that is painful to start with, became even more painful.
Normally thrown into a sentence as a threat.

Guy: Hey babe, how about you and I--
Girl: Touch me or even finish that sentence and I will fuck you with a Diamond-studded cactus.

Diamond-studded cactus by Firebirdchick March 5, 2015