Crater of Diamonds State Park

Where: Arkansas · North America · approx. 34.03, -93.67 (vicinity only)

Why this spot: Cretaceous lamproite pipe (~106 Ma)

What turns up: White, brown and yellow rough diamonds plus jasper, agate, quartz, amethyst and lamproite in a plowed 37 acre field

Access: Open / legal.

State park search field; you keep any diamond you find and can pay a daily fee to dig and sift.

Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.