Uncut natural diamonds formed under extreme geological conditions, valued for their raw structure and insight into Earth’s deep formation processes.
Rough diamonds are uncut natural crystals formed deep within the Earth under extreme pressure and temperature conditions. They represent the raw and unprocessed state of diamond before any human refinement or shaping.
These stones typically display irregular surfaces and uneven textures shaped by geological forces over millions of years. Their natural form provides valuable insight into the conditions of deep mantle formation.
Because they have not undergone cutting or polishing, rough diamonds are primarily evaluated for structure, size potential, and internal quality before being transformed into gemstones.
At John Ann Foley Diamond Institute, we study rough diamonds to understand their geological origins, crystal growth patterns, and transformation processes that lead to gem-quality stones.
Natural formation and structural properties of rough diamonds
Unprocessed crystalline structure in natural state
Irregular texture shaped by geological processes
Formed under extreme mantle pressure and heat
Primary material for cutting and gemological research
Microscopic and structural views of rough diamond formation
