Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Diamond (in Jewelry Setting)
Carbon (C) - Isometric-Hexoctahedral
mineral
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Limestone (specifically a Crushed Aggregate fragment)
Calcium Carbonate (CaCO3)
sedimentary
Limestone (specifically Crushed Limestone/Calcictic)
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granodiorite or Diorite
Granodiorite / Diorite
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Greenstone or Chlorite Schist
Greenschist / Chlorite schist
metamorphic
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite
Igneous
Granite or Granodiorite (Weathered)
Granite
Igneous
Quartz
Silicon dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mother of Pearl and Onyx
Aragonite (Mother of Pearl) and Chalcedony (Onyx)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granite or Pegmatite with Mica
Granitoid
igneous
Granite
Granite
Igneous
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
sedimentary
Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Ferruginous Quartzite (Iron-stained Quartzite)
Quartzite with Iron oxides (FeO(OH) / Fe2O3)
metamorphic
Marble
Recrystallized Limestone (CaCO3)
metamorphic
Quartzite with Iron Inclusions
Quartzite (largely SiO2) with Hematite/Limonite staining (Fe2O3)
metamorphic
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone
Arenite with Iron Oxide matrix (Fe2O3)
sedimentary
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Jadeite (Jade)
Jadeite; NaAlSi2O6
metamorphic
Basalt (Stream-worn Cobble)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Porphyry
Porphyritic Andesite/Dacite
igneous
Graphic Granite
Pegmatitic Feldspar with Quartz intergrowths
igneous
Unakite
Unakite Lepidolite
metamorphic
Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)
Orbicular Quartz Diorite / Tonalite
igneous