All rocks & minerals

Diamond

Diamond (Native Carbon, C)

Faceted clear gemstone ring, likely white sapphire or diamond

Unidentified colorless gemstone; diamond (C) or sapphire (Al₂O₃) cannot be distinguished from the image

Diamond (set in an ornate ring)

Diamond, crystalline carbon (C)

Diamond ring

Diamond, crystalline carbon (C), set in a gold-colored metal ring

Gold ring with a clear faceted gemstone

Likely colorless diamond (carbon, C); identification from the image is uncertain

Gold ring with a clear faceted gemstone

Likely diamond (crystalline carbon, C); identification is uncertain from the image

Diamond-set gold ring (stone identity uncertain)

Possible diamond (crystalline carbon, C); metal setting appears gold-colored

Faceted clear gemstone in a metal setting

Unidentified transparent faceted gem; possibilities include quartz (SiO₂), topaz (Al₂SiO₄(F,OH)₂), or glass—the image is insufficient for identification.

Precious Coral and Jade

Corallium rubrum / Corallium spp. (Coral, CaCO3) and Nephrite/Jadeite (Jade, Ca2(Mg,Fe)5Si8O22(OH)2 / NaAlSi2O6)

Jade and chalcedony-style costume ring

Likely nephrite or jadeite (green cabochons) with orange/cream chalcedony or glass-like beads; identification from the photo is uncertain

Likely jade and pink gemstone jewelry

Green material may be jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); pink beads are unidentified, possibly quartz or coral

Tumbled orange aventurine (likely orange quartzite)

Quartz-rich quartzite, mainly SiO₂; orange color likely from iron-oxide inclusions

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica or amphibole.

Dyed turquoise-colored tumbled stone, possibly howlite or magnesite

Likely dyed Ca₃Si₃O₉(OH)₂ (howlite) or MgCO₃ (magnesite); exact material cannot be confirmed visually

Pink granite

Granite, composed mainly of potassium feldspar, quartz, and dark mica/amphibole

Pink coral and green-stone jewelry

Likely pink coral (calcium carbonate, CaCO₃) set with an unidentified green stone; the image is too indistinct to identify the green material reliably.

Mica-rich schist (probable)

Mica schist, likely muscovite–biotite schist; exact identification requires examination or testing

Pink faceted gemstone ring (stone unidentified)

Possibly pink tourmaline (elbaite); image alone cannot confirm the gem or whether it is natural

Gemstone cocktail ring, likely jade and quartz or glass beads

Possible jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); the peach-colored beads cannot be reliably identified from the image

Likely marcasite jewelry (metal brooch and earrings)

Marcasite, FeS₂ (often pyrite or marcasite stones set in silver)

Gold coin pendant on a chain

Gold (Au), likely a coin set in a gold-colored metal mount

Jewelry with a heart-shaped purple gemstone and an oval shell cameo

Purple stone is possibly amethyst (quartz, SiO₂); cameo is likely carved shell, commonly *Cypraecassis rufa* or *Cassidae* shell

Faceted clear gemstone in a gold-tone ring, likely colorless glass or cubic zirconia

Undetermined; possible cubic zirconia (ZrO₂) or glass (amorphous SiO₂)

Faceted clear gemstone in an ornate ring

Likely colorless cubic zirconia (zirconium dioxide, ZrO₂); the image is insufficient to distinguish it from diamond or glass

Gold ring with a clear faceted gemstone

Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal

Faceted clear gemstone in a gold-tone ring

Likely colorless quartz (SiO₂); the image does not establish the stone identity, and glass or another gem is possible

Diamond in a gold-tone setting

Diamond, crystalline carbon (C)

Precious Coral (Angel Skin Coral) with Jade

Calcium carbonate (CaCO3, mostly calcite) with Jadeite/Nephrite

Banded gneiss (water-worn pebble)

Quartz–feldspar gneiss, with likely mica; exact mineralogy cannot be confirmed from the photo

Pink faceted gemstone ring (stone uncertain)

Possibly tourmaline or glass; image alone cannot establish identity

Small pale-yellow crystal, possibly quartz

Unidentified translucent mineral; quartz (SiO₂) is one possibility, but the image is insufficient for reliable identification.

Diamond (or Diamond Simulant / Melee)

Carbon (C) / or synthetic cubic zirconia (ZrO2)

Milky quartz with iron staining

Quartz, SiO₂; likely massive milky quartz with brown iron-oxide staining

Greenstone pebble (possibly altered basalt)

Chlorite- and/or epidote-altered basalt; exact identification requires testing

Brown chert (likely flint)

Microcrystalline quartz (SiO₂), chiefly chalcedony

Green jade cabochon ring

Possibly jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); the image is insufficient to distinguish them

Translucent calcite-rich rock, possibly calcite vein or marble

Calcite (CaCO₃), likely in a calcite-rich aggregate; exact rock identification is uncertain from the photo

Greenstone (likely altered basalt)

Chlorite- and epidote-altered mafic volcanic rock; commonly called greenschist or greenstone

Rapakivi granite

Rapakivi granite, a granitic intrusive rock composed chiefly of alkali feldspar, plagioclase, quartz, and biotite

Diorite

Diorite, a coarse-grained intrusive igneous rock composed mainly of plagioclase feldspar and hornblende, often with pyroxene or biotite

Quartz vein in iron-stained host rock

Milky quartz (SiO₂) with iron-oxide-stained country rock; exact host rock is unclear from the image

Green cabochon gemstone, likely aventurine or jade

Indeterminate from the image; possible green quartzite (aventurine) or jadeite/nephrite