YAG

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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.

YAG Polished
YAG Classification
Common Name YAG
Species YAG
YAG Optical Properties
Transparency Transparent
Dispersion Strength: Weak Fire Value: 0.028
Refractive Index Over The Limit 1.833-1.833
Tolerance:(+0.010/-0.010)
Optic Character NA
Optic Sign NA
Polariscope Reaction Singly Refractive (SR)
Fluorescence SWUV: Variable
LWUV: Variable
CCF Reaction Green: strong red
Pleochroism None
YAG Characteristic Physical Properties
Hardness 8-8.5
Specific Gravity 4.500-4.600 Typical:4.500
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, Vitreous
Fracture Conchoidal, Uneven
Cleavage None
YAG Chemistry & Crystallography
Chemical Formula Y3AL5O12
Crystal System Cubic

YAG Colors

  • Colorless YAG Colorless
  • Green YAG Green
  • Yellow YAG Yellow

YAG Spectra

YAG Spectra
YTTRIUM ALUMINIUM GARNET

Color due to neodymium. The spectrum here is dominated by the two groups of lines in the yellow and green areas which is typical of this rare earth element. The strongest line in the yellow at 588nm. and in the green at 531nm. Other lines can be seen in the red, orange and blue areas. in deeper colored stones the close groups of lines may merge to form a broad absorption band

YAG Spectra
YTTRIUM LITHIUM FLUORIDE (1st. Ray)

Color due to rare earth element, possibly erbium. Strong sharp absorption lines of various widths in the red, green, blue and violet areas depict a typical rare earth spectrum

YAG Spectra
YTTRIUM LITHIUM FLUORIDE (2nd Ray)

Color due to rare earth element, possibly erbium. Strong sharp absorption lines of various widths in the red, green, blue and violet areas depict a typical rare earth spectrum. A closer grouping of the three lines in the deep blue centered at 450nm. Can be seen.

YAG Spectra
YTTRIUM LITHIUM FLUORIDE (Unpolarized)

Color due to rare earth element, possibly erbium. Strong sharp absorption lines of various widths in the red, green, blue and violet areas depict a typical rare earth spectrum.

Jewelry Television acknowledges the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

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

Countries of Origin

Unknown; China; Russian Federation (the)

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Tim Matthews

Author

Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.