Sedimentary (Alluvial Deposit)

Diamond (in jewelry setting)

Cubic Carbon (C)

Diamond

Carbon (C)

Diamond (in jewelry setting)

Carbon (C)

Gold Nugget

Native Gold (Au)

Chalcedony (Common Agate)

Cryptocrystalline Quartz (SiO2)

Sapphire

Corundum (Al2O3)

Rough Sapphire (possibly Yellow/Green Corundum)

Corundum (Al2O3)

Quartz Pebbles

Silicon Dioxide (SiO2)

Gold Nuggest

Native Gold (Au)

Ruby (Raw Corundum)

Corundum (Al2O3 with Chromium impurities)

Carnelian Agate

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Carnelian Agate

Silicon Dioxide (SiO2)

Ruby (Corundum)

Corundum (Aluminum Oxide) with chromium trace elements, Al2O3

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Ruby / Red Corundum

Al2O3 (Aluminum Oxide with Chromium trace)

Sapphire

Corundum (Al2O3)

Yellow Sapphire

Corundum (Al2O3) with iron impurities

Blue Sapphire

Corundum (Al2O3)

Iridium sand or Osmium-Iridium nugget

Iridosmine / Osmiridium (Platinoid grouping)

Sapphire Rough (Corundum)

Corundum (Aluminum Oxide, Al2O3)

Gold

Native Gold (Au)

Conglomerate

Conglomerate (Sedimentary Rock)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Gold Nugget

Native Gold (Au)

Rough Diamond

Diamond (C)

Conglomerate

Conglomerate

Fossilized Horse Tooth

Equus sp. (Tooth)

Diamond (Martapura/Borneo Diamond)

Carbon (C) - Diamond

Conglomerate

Conglomeratic Sandstone / Polymictic Conglomerate

Breccia (likely quartz-cemented polymict breccia)

Clastic breccia; chiefly angular quartz/feldspar or carbonate clasts in a silica- or carbonate-rich matrix

Diamond

Diamond (Pure Carbon crystallization)

Diamond

Carbon (C)

Diamond

Carbon (C)

Diamond

Carbon (C)

Gold

Gold (Au)

Jasper-bearing Quartzite River Cobble

Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Diamond (Uncut/Rough)

Carbon (C)

Diamond

C (Carbon)

Diamond

Diamond (C)

Diamond

Carbon (C)