Mineral/gemstone imitation

Rhinestone (or glass crystal)

Silicon dioxide (if glass) / Various

Clear, faceted, high luster, brittle. Hardness varies depending on material (glass is typically 5.5-7 on Mohs scale).

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Physical properties

Clear, faceted, high luster, brittle. Hardness varies depending on material (glass is typically 5.5-7 on Mohs scale).

Manufactured. Typically cast or cut from glass, lead crystal, or acrylic to imitate diamonds or other gemstones.

Used primarily in costume jewelry, clothing embellishment, and crafts.

Historically, rhinestones were rock crystals gathered from the river Rhine (hence the name). Today, they are mass-produced from glass or polymers.

Identify by uniform facets, possible foil backing, lack of inclusions common in natural stones, and lower refractive index compared to diamond.

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Gem-set gold ring

Gold alloy setting with a colorless faceted gemstone, possibly quartz or glass; the stone cannot be identified reliably from the image

Howlite (dyed)

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Likely polished blue-green stone bead or small gemstone

Uncertain from the photo; possibly dyed or treated agate/chalcedony, but identification requires testing

Diamond-set gold ring

Diamond (crystalline carbon, C); mounted in a gold alloy setting

Red coral beads (likely dyed or treated coral)

Corallium spp. (precious coral; calcium-carbonate skeleton, chiefly calcite)