Basalt
Basalt (Mafic volcanic rock)
igneous
Category
Antropogenic (Man Made)
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Diamond
Diamond (pure Carbon, C)
mineral
Diamond
C (Pure Carbon)
gemstone
Diamond
Carbon (C)
mineral
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Vesicular Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Red Quartzite
Quartzite (Metamorphic quartz sandstone)
metamorphic
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Diamond
Carbon (C)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Diamond
Carbon (C)
gemstone
Quartzite
Metamorphic Quartz Arenite
metamorphic
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond (Cluster Ring)
Carbon (C)
mineral