Where to Find Diamonds in Wisconsin: 6 Mapped Sites
Wisconsin has 6 documented sites where diamonds have been reported, and the best-known are Bluffs of Miss. River, Plum Creek, and Diamond Bluff. Every site is mapped below with GPS coordinates and links to a full report of access and what's been found there. 6 of the 6 sites are on public-access land.
Last updated: — data compiled by the Rockhounding.org Research Team · methodology
Diamonds Map: Wisconsin
All 6 diamonds sites in Wisconsin. Click a pin for the full site report.
Where Diamonds Are Found in Wisconsin
Diamonds reach the surface in kimberlite and lamproite pipes, and glaciers dragged a scatter of them across the upper Midwest. Search directly in known pipe areas or in gravels downstream of them.
The richest reported sites in Wisconsin: Bluffs of Miss. River, Plum Creek, Diamond Bluff, Eagle, Gravels of Kettle Moraine.
Of the 6 sites, 6 are public access. Check each site report for current land status before you go.
All Diamonds Sites in Wisconsin
- Bluffs of Miss. River — Public Access
- Plum Creek — Public Access
- Diamond Bluff — Public Access
- Eagle — Public Access
- Gravels of Kettle Moraine — Public Access
- Saukville — Public Access
How to Identify Diamonds
Rough diamonds look greasy rather than sparkly — a rounded, slightly oily-looking pebble with an adamantine shine no quartz can match. At hardness 10 a diamond scratches everything, including corundum. Most convincing finds are small octahedral (double-pyramid) crystals; if a clear stone scratches easily or breaks with flat cleavage faces, it is not a diamond.
Not sure what you found? Try our identification guide →Frequently Asked Questions
Where can I find diamonds in Wisconsin?
Wisconsin has 6 mapped sites where diamonds have been reported. The best-known are Bluffs of Miss. River, Plum Creek, and Diamond Bluff. Each listing on the map above includes GPS coordinates, access type, and what has been found there.
How many diamonds sites are mapped in Wisconsin?
We have 6 documented diamonds sites in Wisconsin, compiled from community submissions and published locality records and reviewed by the Rockhounding.org Research Team.
Is it legal to collect diamonds in Wisconsin?
Casual collecting is generally allowed on BLM and National Forest land for personal, non-commercial use — the standard BLM limit is 25 lbs per day plus one specimen. National parks, monuments, and many state parks prohibit collecting, and private land always requires the owner's permission. Check the site report for each location and verify current land status before you dig.
How do I identify diamond?
Rough diamonds look greasy rather than sparkly — a rounded, slightly oily-looking pebble with an adamantine shine no quartz can match. At hardness 10 a diamond scratches everything, including corundum. Most convincing finds are small octahedral (double-pyramid) crystals; if a clear stone scratches easily or breaks with flat cleavage faces, it is not a diamond.
What should I bring to collect diamonds?
The basics: a rock hammer, safety glasses, gloves, a bucket or padded bag for specimens, and a GPS app with the coordinates from this page. Add a spray bottle — wetting a stone makes color and banding far easier to judge in the field.
⚠️ Always verify current regulations, weather conditions, and access requirements before visiting any location. Information provided is based on community submissions and may not be current or accurate.
More to Find in Wisconsin
Data: community submissions — reviewed and approved by the Rockhounding.org Research Team. Always verify current land status, regulations, and access before visiting any site.