YAG (yttrium aluminum garnet) | Gemopedia

Yttrium aluminum garnet (YAG) is a lab created gem first developed in the 1950's. Its primary application was in optics and laser technology, but it turned out to be a convincing diamond simulant. Although YAG has garnet in its name, it is not related to garnet; it is an artificial gemstone with no natural counterpart.
Alternate
Names
Yttrium Aluminum Garnet, Alexite, Amatite, Circolite, Dia-Bud, Diamite, Diamogem, Diamonair, Diamone, Diamonite, Diamondite, Diamonte, Di'yag, Geminair, Gemonair, Kimberly, Linde Simulated Diamond, Nier-Gem, Regalair, Replique, Somerset, Triamond, YAIG, Yttrium Garnet
Colors
Colorless, Medium To Dark Bluish Green Through Yellowish Green, Medium To Dark Blue, Pink, Light To Dark Purplish Red, Orange, Yellow, Purple

YAG (yttrium aluminum garnet) Classification

Common Name

YAG (yttrium aluminum garnet)

Species

YAG

Variety

Colors

Colorless, Medium To Dark Bluish Green Through Yellowish Green, Medium To Dark Blue, Pink, Light To Dark Purplish Red, Orange, Yellow, Purple

Alternate Names

Yttrium Aluminum Garnet, Alexite, Amatite, Circolite, Dia-Bud, Diamite, Diamogem, Diamonair, Diamone, Diamonite, Diamondite, Diamonte, Di'yag, Geminair, Gemonair, Kimberly, Linde Simulated Diamond, Nier-Gem, Regalair, Replique, Somerset, Triamond, YAIG, Yttrium Garnet

Gemstone Groups

Key Separations

Negative reaction to diamond tester, OTL RI, lack of doubling, fluorescence, SG and pavilion flash.Well cut colorless stones will show mostly blue to violet pavilion flash. Stones show strong see through effect.

Comments

Misnomers: synthetic diamond; green: synthetic demantoid. Coloring elements: green (chromium), blue (cobalt), red (manganese), yellow (titanium), purple (neodymium), pink, and orange. Has no natural counterpart.

YAG (yttrium aluminum garnet) Optical Properties

Transparency

Transparent

Refractive Index

Over The Limit 1.833-1.833
Tolerance:(+0.010/-0.010)

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Green: strong red

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.028

Comments

YAG (yttrium aluminum garnet) Chemistry & Crystallography

Chemical Name

Chemical Formula

Y3AL5O12

Synthesis

Czochralski pulled or flux growth

Crystal System

Cubic

Classification

Nature

Synthetic

Crystallinity

Crystalline

Comments

YAG (yttrium aluminum garnet) Characteristic Physical Properties

Hardness

8-8.5

Streak

Specific Gravity

4.5-4.6 Typical:4.5

Toughness

Good

Inclusions

YAG generally is inclusion free but some might have gas bubbles. Pulled material might show curved striae. Green stones might show red flashes when viewed in transmitted light. If the stone is created using the flux method might show tiny grains, white flux or feathers.

Luster

SubAdamantine

Stability

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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