All Diamonds

Non-Diamond (Common Rock/Mineral) (Uncut / Roughly Irregular)

Non-Diamond / Fossilized Coral (Irregular Rough)

Non-diamond mineral (Likely Fossilized Coral or Sedimentary Rock) (Rough/Uncut (Natural amorphous specimen))

Non-diamond (likely Moss Agate / Green Fluorite / Chalcedony) (Rough / Uncut Unformed)

Non-Diamond (Common Mineral) (Rough/Uncut)

Not a diamond; this specimen is Amazonite (a variety of Microcline feldspar). (Rough / Uncut (Natural crystal fragment))

Non-diamond mineral (Likely Quartz variety such as Aventurine or Sunstone) (Rough / Uncut (Natural crystal fragment))

Non-diamond mineral (Common Rock/Granite) (Rough/Uncut (Irregular))

Rough Quartz (Likely Rose Quartz), not a Diamond (Rough / Uncut Natural Mineral)

Not a diamond; Identifiable as a polished semi-precious gemstone or mineral specimen, likely Moss Agate or a variety of ...

Not a Diamond (Quartz/Amethyst Geode piece) (Rough / Uncut Natural Crystal Form)

Non-Diamond (Likely Amethyst/Quartz) (Rough/Uncut Natural Crystal)

The specimen in the image is not a diamond; it appears to be a natural mineral, most likely Amethyst (quartz variety). (...

Non-diamond (Obsidian Arrowhead) (Arrowhead/Follicular (Chipped/Flaked))

Non-diamond (Rock/Mineral Specimen) (Natural Rough / Uncut)

Natural Diamond (Round Brilliant)

Natural Diamond (Likely) (Pear Brilliant)

Probable Simulant (e.g., Cubic Zirconia or White Topaz) (Pear / Drop)

Likely Cubic Zirconia or Simulated Diamond based on visual high dispersion and setting style. (Pear Shape (Teardrop))

Likely Natural Diamond (Pear Shape Brilliant)

Natural (Likely) / Simulated (Possible) (Pear shape (Main stone) and Round Brilliant (Accent stones))

Natural (Likely) (Pear Brilliant)

Diamond Simulant (Likely Cubic Zirconia) (Round Brilliant)

Likely Cubic Zirconia (CZ) or similar diamond simulant (Round Brilliant)

Indeterminate (Likely Simulant or Low-Grade Natural) (Round Brilliant)

Simulated (Likely Cubic Zirconia or glass) (Round Brilliant)

Natural Fancy Color Diamond (Cushion Modified Brilliant)

Natural Fancy Color Diamond (Cushion Modified Brilliant)

Likely Cubic Zirconia or Moissanite (Round Brilliant)

Synthetic (likely Cubic Zirconia or low-end glass/crystal) (Round Brilliant)

Probable Simulant (Glass or Crystal) (Round Brilliant Style)

Likely Natural Diamond (Round Brilliant)

Natural Diamond (Round Brilliant)

Natural (Commercial Melee) (Round Brilliant)

Natural Melee Diamonds (Round Brilliant)

Natural Earth-Mined Diamonds (Old European Cut / Transitional Cut Round)

Natural Melee Diamonds (Cluster) (Round Brilliant)

Natural Diamonds (Round Brilliant)

Likely Cubic Zirconia or Synthetic Amethyst (Simulant) (Oval Brilliant)

Natural (Likely) (Round Brilliant)

Natural Earth-Mined Diamond (Round Brilliant Cut)

The main stone is a Semi-Precious Gemstone (likely Aquamarine or Blue Topaz); the accent stone is likely a Natural Diamo...