Sedimentary (Alluvial Deposit)

Blue Sapphire

Corundum (Al2O3)

Iridium sand or Osmium-Iridium nugget

Iridosmine / Osmiridium (Platinoid grouping)

Sapphire Rough (Corundum)

Corundum (Aluminum Oxide, Al2O3)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Quartzite Pebble

Metamorphic Quartzite

Rough Diamond

Diamond (pure Carbon, C)

Burmese Jadeite

Jadeite (NaAlSi2O6)

Diamond

Carbon (C)

Diamond

Carbon (C)

Rough Diamond

Carbon (C)

Diamond

Native Carbon (C)

Diamond

Carbon (C)

Jadeite (Jade)

Jadeite (NaAlSi2O6)

Diamond

Diamond (C)

Raw Corundum (Sapphire/Ruby variant)

Aluminum oxide (Al2O3)

Rough Diamond

Carbon (C)

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Diamond

Native Carbon (C)

Diamond (set in a gold ring)

Carbon (C) - Adamantine cubic carbon

Quartzite Pebble

Quartzite (primarily SiO2)

Diamond

Diamond (C)

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)

Gold Nugget

Native Gold (Au)

Conglomerate

Clast-supported polymict conglomerate

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Petrified Wood

Silicified wood (Quartz replacement, SiO2)

Diamond (Heart Cut)

Carbon (C)

Diamond

Natural Diamond (Carbon, C)

Diamond

Carbon (C)

Diamond

Carbon (C)

Diamond

Diamond (C)

Rough Diamond

Diamond (pure Carbon, C)