Golden Yellow Australian Sapphire 6.23ct Cushion

STONE ID · 1688

No identification photograph is on file for this stone yet — actual-stone imaging is pending, and the passport will carry it once captured. Product-page images of jewellery designs are visualisations, not evidence, and are never presented here as photographs of the stone.

Gem type: Sapphire
Origin: Australia
Carat weight: 6.23 ct
Dimensions: 12.18 x 9.79 x 6.31 mm
Shape & cut: Cushion
Colour: Golden Yellow
Tone & saturation: Medium tone, vivid saturation
Treatment: Heated
Certification: Available on request

✓ Assessed in-house by our FGAA-qualified gemmologist, Sydney.

Treatment disclosure. Heat treatment disclosed. This sapphire has been heat-treated — a permanent, stable enhancement applied to the great majority of sapphires on the world market, and accepted trade practice when disclosed. Ministry of Gems discloses it here in full. Independent laboratory verification can be arranged on request before purchase.

Full treatment disclosure · independent laboratory certification on request · free lifetime re-authentication — this stone may be returned to the house at any time, by any owner, for verification against this record.

Record Verification

This passport carries a cryptographic fingerprint of the stone’s canonical record. If any detail of this record were altered, the fingerprint would no longer match the house register.

MOG-1688-C840-5449-65A4

SHA-256: c840544965a4f04827eb0a734b59c9e6bc3830eb183ebb641e6d46c6a5a103f0

Version 2 record: the canonical payload is published in full and digitally signed by the house (JWS, Ed25519, key mog-passport-2026-1). The short code above is a convenience label only — verification recomputes the full digest.

Check this fingerprint against the house register →

Issued 2026-08-24 · What this verifies: the integrity of this record against the Ministry of Gems register — it is the house’s own record, not an independent laboratory certificate. Independent certification is available on request.

Record of Custody

2026-08-06 — Catalogued into the Ministry of Gems vault collection
2026-08-06 — Assessed in-house by our FGAA-qualified gemmologist; treatment status recorded in the public Treatment Register
2026-08-23 — Canonical record fingerprinted; independent passport verification enabled
2026-08-24 — Passport v2 issued: canonical payload published, full SHA-256 digest, house EdDSA signature (key mog-passport-2026-1)

This stone appears on the house Treatment Register — every stone we offer, its status public.
This passport is served live from the Ministry of Gems catalogue and can be checked against the signed Passport Register at any time.
Verify at any time: ministryofgems.com.au/products/golden-yellow-australian-sapphire-6-23ct-cushion-1688?view=passport
Rendered 05 October 2026 · Ministry of Gems® · Sydney, NSW · ABN 85 635 892 732