Yowah opal field; GIA authors reported seeing the rough shortly after extraction from the host’s mine.
Source locator · GIA Queensland Opal Fields article, Yowah section.
Source IDs · BOU-SRC-007
Documented specimen record · BOU006
GIA field report · giant Yowah boulder-opal rough
A giant boulder-opal rough observed by GIA at Yowah and described as showing bright bluish play-of-color. The source does not establish dimensions, treatment status or a museum accession.
Diagram · not specimen media · source image remains external
bou:specimen:gia-2017-yowah-giant-rough
Evidence record
- Source / collection
- No museum accession is established by the source; the owner told GIA he wished to donate the rough to a museum.
- Provenance
- Yowah opal field; GIA authors reported seeing the rough shortly after extraction from the host’s mine. Confidence: documented.
- Host material
- host material not individually specified in the cited passage
- Opal component
- bright bluish play-of-color reported by GIA
- State
- rough
- Dimensions
- Not stated by source
- Treatment / synthetic
- not stated by source; not inferred
- Pattern descriptor
- No named pattern assigned by the source; BOU does not add one.
Media rights
Authentic source image kept at the source.
The record is real; the diagram above is not the specimen. BOU006 does not reproduce the source photograph because reusable image rights were not independently established for ICU.
Rights status: external_reference_only_not_reproduced. GIA field-report imagery; reuse rights not independently licensed for ICU.
Interpretation boundary
What stays unknown stays unknown.
This route does not infer treatment, mine identity, rarity, price or authenticity from appearance. A documented field relationship is linked only when the cited record supports it.
Evidence ledger
What is documented, contextual, observed and unresolved.
The ledger is intentionally fail-closed: a missing fact stays missing.
Use field/geology only within the documented link.
- Field-level geology and history may be linked as context because the specimen source explicitly names the field; that context is not additional mine-level provenance.
Description stays descriptive.
- GIA reports bright bluish play-of-color for the documented rough.
ICU visual classification status · not performed.
Unknowns are part of the record.
- Dimensions are not stated in the published specimen record.
- Treatment status is not established by the cited source record.
- Natural versus laboratory-grown status is not independently determined by ICU.
- Monetary value, rarity grade and investment quality are outside this record.
- Mine-level origin is unresolved unless a source explicitly establishes it.
When natural/laboratory-grown or treatment determination matters, use qualified gemological examination/testing. That still does not create automatic geographic origin or valuation.
ICU / CONNECTED DISCOVERY
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