The video in an oasis, and the diamonds' doll box, is a reference from 911 lyrics:
"Keep my dolls inside diamond boxes
Save them till I know I'm gon' drop this
Front I've built around me, oasis
Paradise is in my hand" pic.twitter.com/VIG0SaCNlJ

— Gaga Now ⚡️ (@ladygaganownet) September 18, 2020