Date: October 21st 2015 Episode: American Horror Story: Hotel Episode 3
At the beginning of episode 3, "Mommy", Tristan works on seducing Will Drake into a hookup session. When Tristan is getting ready to kill Will with a pocket knife he pulled out while making out with Will, The Countess appears in the distance.
Cameras switch to zoom in on The Countess, played by Lady Gaga, who tells Tristan not to kill Will Drake with nothing but one hand and her eyes.
For her terrifyingly beautiful scene Lady Gaga wears "Pave Ankh" earrings by Lynn Ban jewelry. The earrings are originally made in sterling silver with white diamonds but is available in gold (which Lady Gaga wears in the scene) by special order. Get a pair for $4,100 here.
Lady Gaga also wore a custom Michael Costello gown, that was never posted in full by Costello or anyone else.