What term describes diamond deposits found at the ocean's shore?

The term that describes diamond deposits found at the ocean's shore is "marine deposits." These deposits occur when diamonds, which are typically formed deep within the Earth's mantle through volcanic activity, are eroded by natural forces and transported to coastal areas. Over time, they accumulate along the shorelines due to the action of waves and currents.

This process distinguishes marine deposits from other types of diamond deposits. Volcanic deposits refer to diamonds found within kimberlite pipes—specific geological formations where diamonds originate. Alluvial deposits are diamonds that have been weathered from their original host rocks and transported by rivers or streams, settling in riverbeds. Artificial deposits indicate diamonds that are synthetically created in labs rather than naturally occurring. The unique geological processes that lead to marine deposits are critical to understanding the different environments where diamonds can be found.