All Diamonds

Non-diamond (Likely Glass or Ice Slab) (Irregular / Rough Piece)

Industrial/Salt and Pepper Natural Diamond (Rough/Partially Polished Geometric)

Non-Diamond / Silicate Mineral (Likely Basalt or River Rock) (Natural Water-Worn / Ovoid Pebble)

Simulant / Cubic Zirconia / Glass (Rough / Uncut / Irregular Shard)

Probable Glass or Quartz (Non-diamond) (Rough/Uncut (Irregular))

Rough Diamond (Likely Natural) (Rough / Uncut Macle or irregular crystal)

Non-diamond (Glass or Quartz) (Rough / Uncut fragment)

Indeterminate / Potential Rough Mineral (Glass or Quartz) (Rough / Uncut Unformed)

Inconclusive/Non-gemstone (None visible)

Natural (Heavily Included / Salt and Pepper) (Round Rose Cut)

Non-diamond (Natural River Rock/Pebble) (Natural/Ovoid (Smooth river-worn pebble))

Rough / Raw Natural Diamond (Irregular / Macle)

Natural (Rough state) (Rough / Uncut (showing natural dodecahedral or octahedral growth patterns))

Non-Diamond (Likely Glass or Quartz) (Rough / Uncut (Conchoidal Fracture))

Natural Rough Diamond (Rough/Uncut (natural crystal form))

Glass Fragment / Industrial Slag (Simulant) (Rough / Irregular Fragment)

Natural (Rough Crystal Segment) (Rough / Uncut (Tabular formation))

Natural (Possible Rough/Uncut or Heavily Included Industrial Grade) (Irregular / Rough Cut (Potentially a crude rose cut...

Rough Diamond or Mineral Fragment (Natural Rough (Uncut))

Indeterminate - Likely Non-Diamond Rough (Irregular/Rough)

Indeterminate; appears more likely to be a crystal stimulant or raw mineral specimen based on surface fracture patterns....

Likely Non-Diamond (Glass or Slag) (Rough / Irregular Fragment)

The provided image displays a transparent, crystalline material that does not exhibit characteristics of a cut diamond; ...

Natural Diamonds (Multi-stone cluster) (Oval composite made of Round Brilliant cuts)

Non-diamond (Glass) (Uncut / Irregular Shard)

Natural Diamond (Cluster Setting) (Oval Halo with Round Brilliant Center Cluster)

Likely Non-Diamond (Glass or Slag) (Rough / Irregular / Amorphous)

Rough Diamond Crystal (Uncut) (Natural Octahedral/Rough Fragment)

Likely Non-Diamond (Glass or Quartz) (Rough/Broken Shard)

Natural Diamond Composite (Oval-Shaped Cluster (Composed of Round Brilliant Melee))

Indeterminate Non-Diamond (Likely Moonstone or Quartz) (Rough/Freeform Cabochon)

Rough Crystal (Likely Glass/Quartz Simulant) (Uncut Rough / Fragmented)

Natural Rough Crystal / Glassy Fragment (Rough / Uncut)

Natural Diamonds (Cluster Setting) (Round Brilliant (Multiple small stones arranged in an Oval-shaped cluster))

The provided image displays a material likely to be industrial glass or slag, not a diamond. It lacks the crystal struct...

Natural Diamonds (Composite Oval Halo (composed of Round Brilliant Melee))

Non-diamond (Glass/Slag) (Rough/Amorphous)

Natural Diamonds (Multi-stone cluster) (Oval Cluster (composed of Round Brilliant melee))

Simulant / Glass (Rough / Fragmented)

The specimen appears to be non-diamond, following more closely with natural Quartz or Glass based on the conchoidal frac...

Indeterminate / Potential Rough Mineral (Likely Glass or Quartz) (Rough / Irregular Shard)

Indeterminate; appears to be an industrial-grade mineral fragment, possibly glass or quartz, rather than gem-quality dia...