Sedimentary (Alluvial Deposit)

Blue Sapphire

Corundum (Al2O3)

Diamond

Diamond (C)

Rough Diamond

Diamond (pure Carbon, C)

Raw Diamond

Carbon (C)

Diamond

Diamond (Pure Carbon, C)

Diamond

Carbon (C)

Diamond (in jewelry setting)

Cubic Carbon (C)

Gold

Native Gold (Au)

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)

Ruby

Corundum (Al2O3 with Chromium trace elements)

Diamond

Diamond (C)

Jadeite (Jade)

Jadeite (NaAlSi2O6)

Raw Corundum (Sapphire/Ruby variant)

Aluminum oxide (Al2O3)

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Rough Diamond

Carbon (C)

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Diamond (set in a gold ring)

Carbon (C) - Adamantine cubic carbon

Quartzite Pebble

Quartzite (primarily SiO2)

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Diamond

Diamond (pure carbon, C)

Gold Nuggest

Native Gold (Au)

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)

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Diamond

C (Carbon)

Diamond

Carbon (C)

Blue Sapphire (in a faceted jewelry setting)

Corundum (Al2O3) with trace Iron and Titanium

Blue Sapphire

Corundum (Al2O3)

Diamond

Diamond (C)

Blue Sapphire

Corundum (Al2O3)

Iridium sand or Osmium-Iridium nugget

Iridosmine / Osmiridium (Platinoid grouping)

Agate (Moss or Banded Agate variety)

Agate (Silicon Dioxide - SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Diamond

C (Carbon)

Diamond

Carbon (C)

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Diamond (Macled/Crystal fragment)

Carbon (C), isometric crystal system

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Conglomerate

Conglomerate (Detrital sedimentary rock)