Primary deposit – Gems found in the rock that carried them to the surface.
Secondary deposit – Gems found away from their primary source.
Alluvial deposit – A deposit where gems are eroded from their source rock, then transported away from the source and further concentrated.
Marine deposit – Secondary diamond deposit carried by river or streams to the ocean floor or shoreline.
Photo: Peter Johnston/GIA. Courtesy: GIA. Resource: Amanda. #eClarity
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