Carnelian
SiO2 (Variety of Chalcedony)
gemstone
Category
Man Made Object (Ring)
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Black Onyx
Chalcedony (SiO2)
gemstone
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Chocolate Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Carnelian (Red Agate)
Carnelian (SiO2 with Hematite inclusions)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sardonyx / Carnelian Agate
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
gemstone
Yellow Sapphire (Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Carnelian
Carnelian (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Carnelian
Carnelian (Varietal of Chalcedony, SiO2 with Iron Oxide impurities)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Carnelian Agate
Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Carnelian (Red Chalcedony)
SiO2 (Silicon Dioxide with Iron Oxide impurities)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Crinoid Fossil in Limestone
Crinoid columnal (Class Crinoidea) in biomicrite
fossil
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Yellow Sapphire
Corundum (Al2O3 with trace amounts of iron)
gemstone
Jadeite Bangle
NaAlSi2O6 (Jadeite pyroxene mineral aggregate)
gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Garnet
Almandine/Pyrope Garnet (X3Y2(SiO4)3)
gemstone
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Charoite
(K,Na)5Ca6Si12O30(OH,F)·nH2O
mineral
Lemon Quartz
Silicon Dioxide (SiO2)
mineral
Chrysoprase
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Bloodstone
Heliotrope (Silicon dioxide, SiO2)
mineral
Mystic Topaz
Coated Al2SiO4(F,OH)2
gemstone
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Opal
Hydrated silica (SiO2 · nH2O)
mineraloid
Diamond
Carbon (C)
gemstone
Diamond (or Cubic Zirconia simulant)
C (Carbon) or ZrO2 (Zirconium Dioxide)
gemstone
Amethyst (Lab-created or facet-grade)
Silicon Dioxide (SiO2) with iron impurities
gemstone
Pink Amethyst (or Pink Quartz)
Silicon Dioxide (SiO2) with trace inclusions
gemstone