Gray Spinel Round Faceted Gemstone

Gray spinel, a transparent variety of vitreous magnesium aluminum oxide, is relatively hard (7.5–8 on the Mohs hardness scale) and presents a true silvery to medium gray color (not a desaturated black or blue). When faceted, the gemstone offers an unexpected refractive brilliance. According to a legend, gray spinel clarifies thoughts, stimulates creativity and emits a protective energy that connects its wearer to the center of the earth. Named for its spiky crystal structure from the Latin "spina" (meaning "thorn"), spinel is a vitreous magnesium aluminum oxide. Hard, durable and occurring naturally in a range of transparent colors, spinel is a versatile gemstone for all forms of jewelry. Round-cut gemstones are highly popular and the most commonly available. Rio round gemstones are calibrated for size and hand-inspected to ensure maximum attractiveness.

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Gemstone type: Spinel
Stone shape: Round
Stone size: 2.5mm, 5mm, 4mm, 3mm, 2mm
Stone type: Natural
Color: Gray
Enhancement: None (N)
Mohs hardness: 7.5–8
Clarity: Eye-clean
Refractive index: 1.719–1.92
Specific gravity: 3.5–4.1
Brand: AGTA
Mineral source: MOZAMBIQUE
Cutting center: India