Diamonds that are mined primarily from pipes are known as:

Diamonds that are mined primarily from pipes are referred to as primary diamonds. These diamonds originate deep within the Earth's mantle and are brought to the surface through volcanic eruptions. The term "primary" signifies their extraction from a source where they are found in their original location, such as kimberlite or lamproite pipes.

This is important because primary diamonds are often associated with more traditional mining methods, which involve the extraction of large volumes of rock and the subsequent processing to separate the diamonds from other minerals. Understanding the classification of diamonds is essential because it impacts their value, rarity, and the methods used for mining and refining.

In contrast, natural diamonds can include both primary and secondary sources, while synthetic diamonds are laboratory-created gemstones. Alluvial diamonds are found in riverbeds or along shorelines, having been transported from their original source, and do not originate directly from mining pipes, which reinforces the distinction between these types of diamond sources.