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Atomic: M.A.C. | Reference
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Yttrium Compounds
   Yttrium aluminium garnet
   Yttrium(III) oxide
Yttrium aluminium garnet Y3Al5O12
A synthetic crystalline material of the garnet group, used as the active laser medium in various solid-state lasers..
It also finds use in jewellery as a diamond simulant. Coloured variants are faceted and valued (as synthetics) for their clarity, durability, high refractive index and dispersion.
Yttrium(III) oxide Y2O3
It is the most important yttrium compound and is widely used to make YVO4:Eu and Y2O3:Eu phosphors that give the red colour in colour TV picture tubes. Yttrium oxide is also used to make yttrium-iron-garnets, which are very effective microwave filters.