Synthetic Material (Not A Rock Or Mineral)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic ZrO₂), possibly glass or white sapphire

Blue-gray stone pebble (possibly slag or a weathered rock)

Unidentified fine-grained rock; composition cannot be determined from the image

Diamond

Carbon (C)

Borosilicate Glass (Manufactured)

SiO2 + B2O3 (Silicon dioxide and Boron trioxide)

Red gemstone ring, likely synthetic ruby or red glass; exact stone cannot be confirmed from the image

Ruby (corundum, Al₂O₃) if natural; the setting appears to be silver-tone metal

Quartz (Druzy / Goldstone Gemstone Cabochon)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Blue Topaz

Topaz [Al2SiO4(F,OH)2]

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Chalcanthite

Copper(II) sulfate pentahydrate (CuSO4·5H2O)

Sandstone

Arenite (SiO2 primarily)

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Cut colorless gemstone, likely quartz or glass imitation

Most plausibly rock crystal (clear quartz, SiO₂); synthetic glass cannot be ruled out from the image

Ametrine

Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities and natural radiation

Tourmalinated Quartz

Crystalline Silicon Dioxide with Schorl inclusions (SiO2 + NaFe3Al6(BO3)3Si6O18(OH)4)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Amethyst ring

Amethyst, purple quartz (SiO₂)

Gold and Cubic Zirconia (San Judas Tadeo Pendant)

Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)

Granite or Pegmatite in host rock

Granitoid / Felsic Intrusive Rock

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Sandstone

Clastic Sedimentary Rock

Iridescent polished gemstone, likely opal

Common or precious opal (hydrated amorphous silica, SiO₂·nH₂O), possibly synthetic or glass imitation

Citrine

Citrine (Silicon Dioxide, SiO2)

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

Smoky Quartz (with Druzy/Polished Edge)

Smoky Quartz (Silicon Dioxide, SiO2)

Colorless faceted gemstone (most likely synthetic cubic zirconia)

Cubic zirconia, ZrO₂ (likely synthetic); natural alternatives include quartz or diamond

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Sandstone

Clastic Sedimentary Rock

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Mixed gravel and small stones

Unsorted gravel; individual clasts are not identifiable from the image

Strawberry Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Sandstone

Clastic Sedimentary Rock

Red faceted gemstone, likely synthetic ruby or red glass

Ruby: corundum, aluminum oxide (Al₂O₃), chromium-colored; identity cannot be confirmed visually

White pebbles (rock material not identifiable from the image)

Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), with iron-oxide staining

Diamond

Natural Diamond (Carbon, C)

Diamond (Cut Gemstone)

Carbon (C)