Crystal and spike necklace, £348 (in Casey’s mouth), Joomi Lim matchesfashion.com Photograph: Julian Broad for the Observer Magazine
Crystal necklace, £350, and square crystal necklace, £270, Anton Heunis my-wardrobe.com Photograph: Julian Broad for the Observer Magazine
Necklace, £485 Swarovski, swarovski.com
Photographer: Julian Broad for the Observer
Fashion editor: Jo Jones
Makeup: Yin Lee @ Premier Hair & makeup using Clinique
Hair: Richard Scorer at Premier Hair & Makeup for Haringtons using L'oreal
Model: Casey Legler, Ford Models Photograph: Julian Broad/Julian Broad for the Observer Magazine