Granite
Phaneritic plutonic rock (Felsic)
igneous
Category
Synthetic Or Natural Fiber
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Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Diamond (in jewelry)
Carbon (C)
mineral
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Porphyritic Rhyolite
Porphyritic Rhyolite (Felsic volcanic rock)
igneous
Diamond
Carbon (C)
mineral
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock (composed主に of SiO2, Al2O3, K2O, Na2O)
igneous
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Granite
Phaneritic intrusive igneous rock
igneous
Quartz (Yellow/Milky variety)
Silicon Dioxide (SiO2)
mineral
Citrine (Heat-treated)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Cat's Eye Shell (Shiva Shell)
Operculum of the Turbo petholatus (Tapestry Turban Snail), predominantly Calcium Carbonate (Aragonite)
mineraloid / biogenic specimen
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Citrine
Silicon dioxide (SiO2)
mineral
Diamond (Emerald Cut)
Carbon (C)
mineral
Chert (Hag Stone / Hole Stone)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Howlite (Dyed to resemble Turquoise)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Raw Diamond
Diamond (pure Carbon, C)
mineral
Blue Tiger's Eye (Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Green Aventurine
Aventurine Quartz (SiO2 + Muscovite/Fuchsite)
metamorphic
Citrine
Silicon Dioxide (SiO2)
Mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)
igneous
Diamond (Cut Gemstones in Jewelry)
Carbon (C)
gemstone
Rough Green Sapphire (Corundum)
Corundum (Al2O3 - Aluminum Oxide with trace elements)
mineral
Diamond
Diamond (C)
mineral
Moonstone (Orthoclase Feldspar)
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusions of AlAl6BSi3O18
mineral