gemstone

Blue gemstone, likely aquamarine

Beryl, Be₃Al₂Si₆O₁₈, colored blue by iron impurities

AI-generated identification · may be incorrect

Hardness 7.5–8 Mohs; pale blue to blue-green, vitreous luster, hexagonal crystal structure, and poor-to-indistinct cleavage. The rounded transparent appearance suggests a polished or cut stone, though a glass imitation cannot be ruled out from the image.

Identified August 17, 2026More gemstone →

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Physical properties

Formation & geological history

Aquamarine forms in lithium- and beryllium-rich granite pegmatites and related hydrothermal veins, crystallizing during late stages of igneous activity, generally in Phanerozoic continental crust.

Uses & applications

Used primarily in faceted jewelry and mineral collections; beryl varieties are also valued as ornamental gems. Industrial beryl is uncommon compared with other beryllium ores.

Geological facts

Its blue color commonly results from Fe²⁺, while yellow-green heating or irradiation treatments may alter color. Large crystals are associated with Brazil, Pakistan, Afghanistan, Nigeria, Madagascar, and Russia.

Field identification & locations

Identify genuine aquamarine by its blue-green color, glassy luster, high hardness, and often visible inclusions; refractive-index or specific-gravity testing distinguishes it from glass and blue topaz. A loupe and gemological testing are recommended.