Gadolinium Gallium Garnet and Cordierite Iolite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Gadolinium Gallium Garnet and Cordierite Iolite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Gadolinium Gallium Garnet and Cordierite Iolite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character. Cordierite Iolite has Biaxial/+ character.
Similar to their colors, Gadolinium Gallium Garnet and Cordierite Iolite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Gadolinium Gallium Garnet is Not Available while Gadolinium Gallium Garnet is Not Available in appearance.