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gptkbp:instance_of
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gptkb:jewelry
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gptkbp:associated_with
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gptkb:Montana_State_Gemstone
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|
gptkbp:availability
|
limited due to mining restrictions
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|
gptkbp:available_colors
|
primarily blue, some with violet hues
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gptkbp:color
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gptkb:blue
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gptkbp:colors
|
known for its unique blue color
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|
gptkbp:composed_of
|
Al2 O3 with trace elements
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|
gptkbp:cultural_associations
|
associated with wisdom and royalty
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|
gptkbp:cultural_significance
|
symbol of loyalty and nobility
|
|
gptkbp:cut
|
advanced cutting techniques used
commonly faceted or cabochon
often cut to maximize color
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|
gptkbp:difficulty
|
gptkb:9
9 on the Mohs scale
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|
gptkbp:discovery
|
gptkb:late_19th_century
placer mining
discovered in the 1890s
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|
gptkbp:emphasizes
|
transparent
typically eye-clean
|
|
gptkbp:environmental_impact
|
mining has ecological concerns
|
|
gptkbp:famous_for
|
vivid blue color
rich saturation
|
|
gptkbp:famous_jewelry_pieces
|
used in royal and celebrity jewelry
|
|
gptkbp:famous_landmark
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gptkb:Yogo_Sapphire_Mine
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|
gptkbp:gemological_classification
|
corundum
|
|
gptkbp:gemological_properties
|
high refractive index
|
|
gptkbp:gemstone_family
|
part of the corundum family
|
|
gptkbp:gemstone_rarity
|
considered rare compared to other sapphires
|
|
gptkbp:grades
|
graded by hue, tone, and saturation
|
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gptkbp:historical_mines
|
historically significant mining site.
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gptkbp:historical_significance
|
important in American gem history
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Yogo Sapphire
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gptkbp:investment
|
considered a good investment
|
|
gptkbp:is_compared_to
|
gptkb:Kashmir_Sapphire
|
|
gptkbp:is_considered
|
rare gem
|
|
gptkbp:is_found_in
|
gptkb:Montana
|
|
gptkbp:is_known_for
|
blue color
|
|
gptkbp:jewels
|
September birthstone
|
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gptkbp:location
|
gptkb:Montana
|
|
gptkbp:luster
|
vitreous
|
|
gptkbp:market
|
high demand in luxury markets
popular in the luxury market
|
|
gptkbp:mined
|
Yogo Gulch
|
|
gptkbp:mining_locations
|
Yogo Gulch
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|
gptkbp:notable_collection
|
sought after by gem collectors
|
|
gptkbp:notable_exhibitions
|
displayed in gem shows and exhibitions
|
|
gptkbp:notable_feature
|
star effect (asterism) possible
|
|
gptkbp:notable_locations
|
gptkb:Montana's_Yogo_Gulch
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gptkbp:notable_production
|
featured in high-end jewelry collections
|
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gptkbp:origin
|
gptkb:Montana,_USA
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gptkbp:size
|
varies from small to large stones
|
|
gptkbp:surface
|
approximately 3.95 to 4.00
|
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gptkbp:symbolizes
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gptkb:wisdom
|
|
gptkbp:treatment
|
none commonly used
usually untreated
|
|
gptkbp:uses
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gptkb:jewelry
|
|
gptkbp:values
|
highly valued
|
|
gptkbp:bfsParent
|
gptkb:Montana
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gptkbp:bfsLayer
|
4
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