×

Nacre
Nacre
☒

Coral
Coral
☒



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Nacre
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Coral
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
-
-
0.19
-
-9999
-
-
-9999
-
 
-
-
0.03
Translucent
1.486-1.658
-
Trigonal
0.160-0.172
Translucent

Compare Black Gemstones

Black Gemstones

Melanite
Melanite
Hypersthene
Hypersthene
Holmquistite
Holmquistite
Coral
Snowflake Obsidian
Coral Vs Snowflake Obsidian
Coral
Sheen Obsidian
Coral Vs Sheen Obsidian
Coral
Schorl
Coral Vs Schorl

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