It has a symmetrical, conical volcanic shape, and is among the southernmost 5,000 metre peaks in the Andes.

Immediately to the east of the peak, on the eastern side of the caldera floor, is Laguna del Diamante, a lake that formed when lava flows blocked drainage channels from the caldera in 1826.

The Diamante Caldera erupted 450 cubic kilometers (108 cu mi) of tephra, 450 ka.

Hence, while less glaciated than Patagonia, it has more permanent snow on the wet, Chilean side than peaks of similar elevation to the north.

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