Simpire — The Teck Crescent Tiara: 3 versions set Release!!...
Duchess of Leuchtenberg's Emerald Tiara by Glitterberry Sims - The Sims 4 Download - SimsFinds.com
Princess Tiara - The Sims 4 Create a Sim - CurseForge
I found the right Diana-inspired hair, earrings, and tiara so I thought I'd give it a go. Needs a bit more work, I know, but I'll probably fix that later. : r/thesims
BEO CREATIONS: Tiara "Eagle"
The Sims Resource - Faceted gems tiara
The Sims Resource - NataliS_Winter fairytale tiara