Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Category
Organic Gemstone
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Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Amethyst (Pale/Light Variety)
Quartz (Silicon Dioxide) with Iron impurities - SiO2
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Jasper (specifically Red or Brecciated Jasper variant)
Jasper (Microcrystalline Quartz - SiO2)
sedimentary
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)
metamorphic
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Tiger's Eye)
metamorphic
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Diamond (Cluster Ring)
Carbon (C)
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Serpentine (Serpentinite)
Antigorite, Lizardite, or Chrysotile; (Mg,Fe)3Si2O5(OH)4
metamorphic
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Tiger's Eye
Silicon Dioxide (SiO2) with Limonite/Goethite inclusions
mineral
Diamond
Native Carbon (C)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Almandine Garnet (weathered)
Almandine (Fe3Al2(SiO4)3)
mineral
Garnet and Quartz
Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)
mineral
Red Jasper
Jasper (Silica with Iron Oxide inclusions), SiO2
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Green Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Lazulite
Magnesium Aluminum Phosphate Hydroxide (MgAl2(PO4)2(OH)2)
mineral
Unakite
Epidotized Granite
metamorphic
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Iron-stained River Cobble)
Microcrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (C)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sunstone
Oligoclase (Feldspar variety), (Na,Ca)(Si,Al)4O8
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
mineral
Garnet
Garnet Group (often Pyrope or Almandine); X3Y2(SiO4)3
mineral
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral