Black Prince's Ruby
E164512
The Black Prince's Ruby is a famous large red spinel, long mistaken for a ruby, that has adorned the British royal regalia for centuries and now prominently decorates the Imperial State Crown.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Black Prince's Ruby canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T1424019 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Black Prince's Ruby Context triple: [Imperial State Crown, containsGemstone, Black Prince's Ruby]
-
A.
Regent Diamond
The Regent Diamond is a famed 140.64-carat Indian diamond renowned for its exceptional clarity and long association with French royalty and the French Crown Jewels.
-
B.
Black Prince
The Black Prince, formally Edward of Woodstock, was a renowned 14th-century English prince and military commander celebrated for his victories at battles such as Crécy and Poitiers during the Hundred Years' War.
-
C.
Sovereign's Orb
The Sovereign's Orb is a ceremonial golden orb surmounted by a cross, symbolizing the monarch's Christian authority and temporal power, traditionally held during British coronations such as that of Queen Elizabeth II.
-
D.
St Edward's Crown
St Edward's Crown is the historic solid gold coronation crown of British monarchs, renowned as one of the most important and sacred symbols of the United Kingdom’s monarchy.
-
E.
Imperial State Crown
The Imperial State Crown is one of the United Kingdom’s principal royal crowns, richly set with historic gemstones and worn by the monarch on formal state occasions.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Black Prince's Ruby Target entity description: The Black Prince's Ruby is a famous large red spinel, long mistaken for a ruby, that has adorned the British royal regalia for centuries and now prominently decorates the Imperial State Crown.
-
A.
Regent Diamond
The Regent Diamond is a famed 140.64-carat Indian diamond renowned for its exceptional clarity and long association with French royalty and the French Crown Jewels.
-
B.
Black Prince
The Black Prince, formally Edward of Woodstock, was a renowned 14th-century English prince and military commander celebrated for his victories at battles such as Crécy and Poitiers during the Hundred Years' War.
-
C.
Sovereign's Orb
The Sovereign's Orb is a ceremonial golden orb surmounted by a cross, symbolizing the monarch's Christian authority and temporal power, traditionally held during British coronations such as that of Queen Elizabeth II.
-
D.
St Edward's Crown
St Edward's Crown is the historic solid gold coronation crown of British monarchs, renowned as one of the most important and sacred symbols of the United Kingdom’s monarchy.
-
E.
Imperial State Crown
The Imperial State Crown is one of the United Kingdom’s principal royal crowns, richly set with historic gemstones and worn by the monarch on formal state occasions.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
gemstone
ⓘ
precious stone ⓘ red spinel ⓘ |
| adorns | Imperial State Crown ⓘ |
| approximateShape | irregular cabochon ⓘ |
| associatedWith |
Edward of Woodstock, the Black Prince
ⓘ
linked to:
Edward the Black Prince
|
| associatedWithEvent |
British coronation ceremonies
ⓘ
State Opening of Parliament ⓘ |
| classification | historic gemstone ⓘ |
| color | red ⓘ |
| country | United Kingdom ⓘ |
| culturalSignificance | iconic gemstone of the British monarchy ⓘ |
| decorates | cross pattée of the Imperial State Crown ⓘ |
| displayStatus | on public display with the Crown Jewels ⓘ |
| distinguishedFrom | corundum ruby ⓘ |
| famousFor |
being long misidentified as a ruby
ⓘ
prominent placement on the Imperial State Crown ⓘ |
| gemCut | polished but unfaceted ⓘ |
| gemType | spinel ⓘ |
| hasInscription | small drilled hole from earlier mounting ⓘ |
| heritageStatus | national treasure of the United Kingdom ⓘ |
| historicalEra | Middle Ages ⓘ |
| housedIn | Jewel House ⓘ |
| locatedIn | Tower of London ⓘ |
| material | spinel ⓘ |
| mineralClass | spinel ⓘ |
| namedAfter |
Edward of Woodstock, the Black Prince
ⓘ
linked to:
Edward the Black Prince
|
| notableFor |
deep red color
ⓘ
large size ⓘ long association with English and British monarchs ⓘ |
| ownedBy | Crown Estate ⓘ |
| owner | British monarch ⓘ |
| partOf |
British Crown Jewels
ⓘ
linked to:
Crown Jewels of the United Kingdom
|
| positionInCrown | front cross above the Cullinan II diamond ⓘ |
| setting | gold mount ⓘ |
| symbolizes |
monarchical continuity
ⓘ
royal authority ⓘ |
| usedAs | royal regalia ornament ⓘ |
| usedIn |
British royal regalia
ⓘ
English royal regalia ⓘ Imperial State Crown of the United Kingdom ⓘ
linked to:
Imperial State Crown
|
| visibility | clearly visible on photographs of the Imperial State Crown ⓘ |
| wasMistakenFor | ruby ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Black Prince's Ruby Description of subject: The Black Prince's Ruby is a famous large red spinel, long mistaken for a ruby, that has adorned the British royal regalia for centuries and now prominently decorates the Imperial State Crown.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.