01
Calibrate the screen
Align the display outline with your bank card or other method — Astraia now knows your screen’s exact scale.
Astraia
Astraia
The technology
Our proprietary on-screen calibration maps standard physical benchmarks to your device’s exact pixel geometry, delivering sizing precise to the millimetre to help eliminate the guesswork of buying fine jewelry online.
How it works
Align the display outline with your bank card or other method — Astraia now knows your screen’s exact scale.
Rest a ring you already own on the screen, or wrap the on-screen band around your finger.
Your inner diameter in mm, converted to US, UK, EU and JP sizes and saved — with pieces that fit.
Curated luxury
A small edit of engagement rings, fine bands and artisan pieces from jewellers we trust — shoppable in your size once you’ve measured in the app.
Cushion Cut Diamond Halo Ring
View at Brilliant Earth →
Hand-Hammered Solid Gold Band
View at Vrai →
Vintage Inspired Diamond Pendant
View piece →We may earn a commission on pieces bought through these links. It never changes what you pay, or what we choose to feature.