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precious and semiprecious gemstone and mineral glossary adamantine luster refers to the diamondlike luster of a gemstone gemstones with a diamondlike luster include diamond of course demantoid garnet and sphene, enter volume select a unit of volume and specify a material or substance to search for use as a wildcard for partial matches or enclose the search string in double quotes for an exact match
adularescence is an optical phenomenon typically associated with moonstone a member of the feldspar family it manifests as a soft shimmer moving within the gemstone as it is rotated, unit cell crystal structure is described in terms of the geometry of arrangement of particles in the unit cell the unit cell is defined as the smallest repeating unit having the full symmetry of the crystal structure the geometry of the unit cell is defined as a parallelepiped providing six lattice parameters taken as the lengths of the cell edges a b c and the angles between them α , one of the great challenges of gemology is the development of an accurate simple consistent and reproducible technique for gemstone color measurements and specifications, print the following documents to submit your gemstone to gia print the documents below and include in the package with your gemstone if you dont have access to a printer you can email a copy to yourself and print later. DISCLAIMER: This image is provided only for personal use. If you found any images copyrighted to yours, please contact us and we will remove it. We do not intend to display any copyright protected images.