FKA Twigs Engagement Ring Pictures Robert Pattison; Celebrity Weddings, Met Gala

Upon closer inspection, it appears to be a Victorian-style tiara setting, with a large pear-shaped diamond on the bottom. Kind of like this one:

Platinum Tiara from Trumpet & Horn, $4,650 for similar (in yellow gold).

Thoughts on FKA Twigs and Robert Pattinson's first red carpet appearance? And how 'bout that engagement ring?