Color Change Spinel | Gemopedia

Along with a rich range of hues, spinel offers color-change varieties. Color change spinel usually appears violet blue under fluorescent light and purple under incandescent light. Spinel is one of few gemstones that require no special treatments; its beautiful, vivid colors and clarity are entirely natural. Spinel is also excellent for use in jewelry because it is hard, tough, and often more affordable than ruby or sapphire.
Colors
Medium-Dark Purple Incandescent, Medium To Dark Violetish Blue In Daylight, Fluorescent Light

Color Change Spinel Classification

Common Name

Color Change Spinel

Species

Spinel

Variety

Color Change Spinel

Colors

Medium-Dark Purple Incandescent, Medium To Dark Violetish Blue In Daylight, Fluorescent Light

Alternate Names

Gemstone Groups

Spinel

Key Separations

Color change, RI and SG, lack of doubling, SR nature and spectrum

Comments

Color Change Spinel Optical Properties

Transparency

Transparent

Refractive Index

1.718
Tolerance:(+0.017/-0.008)

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Inert
LWUV: Moderate to strong chalky red

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.02

Comments

Color Change Spinel Chemistry & Crystallography

Chemical Name

magnesium aluminum oxide

Chemical Formula

MgAl2O4

Synthesis

Crystal System

Cubic

Classification

Oxide

Nature

Natural

Crystallinity

Crystalline

Comments

Color Change Spinel Characteristic Physical Properties

Hardness

8

Streak

Specific Gravity

3.57-3.7 Typical:3.6

Toughness

Varies

Inclusions

Natural mineral inclusions like spinel or apatite, needles, negative crystals in the shape of an octahedral, and fingerprints.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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