gemstone

Polished citrine-like quartz (possibly yellow glass or coated quartz)

Quartz, SiO₂; yellow variety commonly called citrine

AI-generated identification · may be incorrect

Yellow-gold, translucent, strongly vitreous luster, and irregular faceted/polished surfaces. Quartz hardness is Mohs 7, with no cleavage and conchoidal fracture; the image alone cannot confirm hardness or authenticity.

Identified September 22, 2026More gemstone →

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Physical properties

Formation & geological history

Natural citrine forms when iron-bearing quartz develops yellow coloration in hydrothermal or pegmatitic environments; much commercial citrine is heat-treated amethyst. Geological ages vary with the host rock.

Uses & applications

Used as a gemstone, ornamental stone, and collector specimen. Small polished pieces commonly sell for modest prices unless clarity, color, and provenance are exceptional.

Geological facts

The vivid metallic-looking yellow and molded-looking grooves could indicate heat-treated quartz, resin, or yellow glass rather than natural citrine. “Ah.nang” provides no clear geological locality or diagnostic property.

Field identification & locations

Common sources include Brazil, Madagascar, Uruguay, and Zambia. Test cautiously with a steel file or known quartz, inspect with a loupe for bubbles and facet edges, and check refractive index (about 1.544–1.553) or specific gravity (about 2.65) for confirmation.