Synthetic Or Natural Fiber

Tiger’s-eye bracelet/bead segment

Chatoyant quartz (SiO₂), likely brown tiger’s-eye with iron-oxide alteration

Painted River Rock

Artificially Coated Sedimentary Rock

Blue Sapphire

Corundum (Al2O3)

Tumbled carnelian (likely)

Carnelian, orange-red variety of cryptocrystalline silica (SiO₂), chalcedony

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Ruby

Corundum (Al2O3 with Chromium traces)

Polished tiger’s-eye

Quartz variety, primarily fibrous chalcedony pseudomorph after crocidolite; SiO₂

Polished tiger iron cabochon

Banded iron formation (BIF), chiefly hematite/magnetite, jasper, and tiger’s-eye quartz

Hematite bead bracelet

Hematite (iron(III) oxide, Fe₂O₃), likely polished specular hematite

Ruby cabochons

Corundum, aluminum oxide (Al₂O₃), colored red by chiefly chromium

Amethyst cabochon ring

Amethyst, purple quartz (SiO₂)

Smoky Quartz

Silicon dioxide with aluminum impurities (SiO2)

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Polished tiger’s-eye

Chatoyant quartz, primarily SiO₂, with iron-oxide staining

Smoky Quartz

Silicon Dioxide (SiO2)

Chalcanthite

Copper(II) sulfate pentahydrate (CuSO4·5H2O)

Corundum (variety Ruby/Sapphire)

Aluminum Oxide (Al2O3)

Tumbled yellow chalcedony

Microcrystalline quartz (SiO₂), likely yellow jasper or chalcedony

Tumbled Tiger’s Eye

Quartz variety, fibrous SiO₂ with crocidolite pseudomorphs

Tiger’s-eye cabochon or polished fragment

Chatoyant quartz, chiefly quartz (SiO₂) with iron-oxide inclusions

Faceted red gemstone, likely garnet

Garnet group; probably almandine-pyrope solid solution, (Fe,Mg)₃Al₂(SiO₄)₃

Assorted gemstone jewelry

Mixed natural and synthetic gemstone cabochons and faceted stones; individual species cannot be determined reliably from this image

Blue Sapphire

Corundum (Al2O3)

Polished blue-purple chalcedony (likely dyed or coated)

Chalcedony, microcrystalline quartz (SiO₂)

Dyed Agate

Agate (Cryptocrystalline Quartz), SiO2

Polished tiger’s-eye with black hematite/goethite band

Quartz (SiO₂), fibrous pseudomorph after crocidolite, with iron oxides

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Tiger’s eye

Quartz (SiO₂), pseudomorphic fibrous quartz with crocidolite inclusions

Actinolite (likely fibrous amphibole)

Actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possibly an actinolite–tremolite specimen

Polished yellow chalcedony (likely quartz pebble)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Smoky Quartz

Silicon Dioxide (SiO2)

Black spinel bead strand

Spinel, magnesium aluminum oxide (MgAl₂O₄)

Turquoise cabochon jewelry

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Sapphire

Corundum (Al2O3)

Blue Sapphire

Corundum (Al2O3)

Pink tourmaline (rubellite)

Elbaite tourmaline, lithium sodium aluminum borosilicate: Na(Li1.5Al1.5)Al6(BO3)3Si6O18(OH)4

Tumbled brown-and-olive chalcedony

Chalcedony, microcrystalline quartz (SiO₂), possibly jasper or brown agate

Tumbled blue-gray chalcedony (likely blue agate)

Chalcedony, microcrystalline quartz (SiO₂)

Smoky Quartz

SiO2 (Silicon Dioxide)

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Gemstone butterfly brooch/pendant

Likely faceted pink tourmaline or synthetic spinel in gilt metal; exact identification requires testing