Cornflower Blue Ceylon Sapphire 5.71ct Oval

Name: Cornflower Blue Ceylon Sapphire 5.71ct Oval
Brand: Ministry of Gems

STONE ID · 1398

Identification photograph — this individual stone, as catalogued

Gem type: Sapphire
Origin: Ceylon (Sri Lanka)
Carat weight: 5.71 ct
Dimensions: 11.43 x 8.85 x 6.66 mm
Shape & cut: Oval
Colour: Cornflower Blue
Tone & saturation: Moderate saturation
Treatment: Natural — independently verified
Certification: Available on request

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

Treatment disclosure. Independently verified as a 100% natural, earth-mined gemstone by GST valuer Scott Brown F.G.A.A., NJVA Gold Member No. 033. This verification establishes natural origin. It does not determine whether the stone has been heat treated: heat treatment status is not stated on the supplier's parcel record for this stone and we make no claim either way. Independent laboratory testing is available on request and any result is disclosed in writing before sale.

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-1398-AEC8-F6C9-3FF6

SHA-256: aec8f6c93ff64fa940264cd5643037472a613addcaaedbc2a3c57b1fdf9f9758

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 2026-09-03 · 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)
2026-08-24 — PURCHASE HELD pending independent treatment verification — human-reviewed hold available via enquiry
2026-08-30 — Independent verification recorded — assessed as a 100% natural, earth-mined gemstone by GST valuer Scott Brown F.G.A.A., NJVA Gold Member No. 033; purchase hold lifted and the stone returned to ordinary sale. Natural origin only; heat treatment not determined.

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/cornflower-blue-ceylon-sapphire-5-71ct-oval-1398?view=passport
Rendered 04 October 2026 · Ministry of Gems® · Sydney, NSW · ABN 85 635 892 732

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