The Crater of Diamonds State Park in Murfreesboro, Arkansas, is the world’s only diamond mine open to the public. Founded after a commercial discovery in 1906 and operated as a state park since 1972, the site allows visitors to search for diamonds and keep any they find. Each year, thousands of guests tour the 37.5-acre plowed field, using techniques such as sifting, hand-searching, and wet screening to uncover rough diamonds and other minerals. This guide explains the mine’s history, geology, rules, and practical steps for visitors who want to search responsibly and safely.
History of the Arkansas Diamond Discovery and Mine
Early Commercial Interest and the 1906 Discovery
Diamonds were first documented on the site in 1906 when John Huddleston found two crystals on his farm in Pike County. The discovery led to the formation of the Arkansas Diamond Mining Company and later the Ozark Diamond Mines Corporation, which operated a commercial diamond mine in the early 20th century. Initial reports described high-quality stones, drawing national attention and establishing the region as a notable diamond-bearing area. The property changed hands several times before the state acquired it in 1970 to create a public recreational area.
Transition to a Public State Park
In 1972, the Arkansas Department of Parks, Heritage, and Tourism opened the Crater of Diamonds State Park to the public. By allowing visitors to search for diamonds in the same field where commercial operations once existed, the park combined tourism, education, and conservation. Park staff maintain a 37.5-acre search area by periodically plowing and hand-screening the soil to improve visibility and access to potential diamonds. Interpretive programs, exhibits, and visitor centers now help guests understand the geology and history behind each found stone.
Geology and Diamond Formation at the Crater
Volcanic Roots of the Deposit
The diamonds at the Crater of Diamonds originated in the Earth’s mantle and were brought to the surface by a type of volcanic eruption known as a kimberlite or lamproite event. The eruption that formed the crater occurred approximately 95 million years ago during the Cretaceous period. Unlike many diamond pipes that are primarily composed of kimberlite, the Crater of Diamonds is associated with a rarer lamproite-related process, which explains the presence of diamonds in this unique geologic setting.
Mineral Association and the Search Area
Diamonds are not the only valuable finds at the site; visitors commonly discover quartz, calcite, barite, and other indicator minerals that suggest mantle-derived material. The diamonds themselves tend to be small, often weighing less than 0.1 carats, though larger stones have been recovered over the years. Because diamonds are denser and less weathered than many surrounding minerals, they can be concentrated in areas where water and soil movement have occurred, such as near drainage lines and in screened excavations.
How the Public Diamond Mine Operates Today
Search Methods and Access Rules
- Visitors may search the 37.5-acre designated search area using hand sifting, hand-searching, or dry/wet screening methods.
- Tools such as screens, scoops, and small hand shovels are permitted; large excavating equipment is not allowed.
- Diamonds must be kept by the finder, and there is no charge for entry to the search area beyond standard park fees.
- The park sets daily capacity limits and may require reservations during peak seasons to manage traffic and site preservation.
Field Maintenance and Safety Practices
To ensure continued public access, park staff regularly inspect and grade the search field, remove debris, and control vegetation. Safety measures include clearly marked boundaries, guidance on tool use, and protocols for handling suspicious items. Rangers educate visitors on responsible searching, emphasizing that damaging plants, disturbing archaeological features, or exporting materials improperly is prohibited. These practices help balance recreational diamond hunting with long-term site integrity.
Visitor Information and Planning Tips
Practical Considerations for a Successful Trip
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Location | Murfreesboro, Pike County, Arkansas | Official park resources |
| Search Area Size | 37.5 acres | Arkansas State Parks |
| Typical Diamond Size | Often under 0.1 carats; larger stones recorded | Park reports and visitor records |
| History of Commercial Mining | Operations from early 1900s to mid-20th century | Historical documents and mining records |
| Public Access Since | 1972 as a state park | Arkansas Department of Parks |
| Admission | Included with park entry fees; permits may be required at peak times | Current park pricing and policies |
Best Times and What to Bring
Plan your visit in the spring, fall, or winter for more comfortable temperatures and drier field conditions; summer visits can be hot and humid. Bring sturdy footwear, sun protection, water, a small screening tool or handheld sieve, and a container for collected material. Check the park website for admission rates, weather-related closures, and reservation requirements, especially on holidays and weekends.
Maximizing Your Chances and Understanding Finds
Techniques That Improve Discovery Odds
Because diamonds can be visually similar to quartz and other common minerals, focus on areas with darker, more weathered soil and pay attention to instructions from rangers. Screening material through a fine mesh in water can help separate lighter waste from denser stones. Sorting material in trays and using a magnifier can make identification easier, though professional appraisal is recommended for any promising crystals. Remember that most stones found are ornamental or mineral specimens rather than gem-quality diamonds.
Ethical and Legal Considerations
Visitors should follow all posted rules, respect cultural and natural resources, and avoid digging deep holes that can cause erosion or safety hazards. If you find a stone that you believe may be significant, contact park staff before removing it from the site. Selling diamonds or related materials across state or international borders may be subject to export controls, so familiarize yourself with relevant regulations before you travel. Responsible searching supports the preservation of this unique public resource for future visitors.
Why the Crater of Diamonds Remains a Unique Destination
Few places in the world allow the public to actively search for and keep diamonds, which makes the Crater of Diamonds State Park a standout attraction for tourists, mineral enthusiasts, and families. Its combination of accessible geology, transparent rules, and hands-on experiences offers enduring appeal. For visitors who plan ahead, follow site guidelines, and respect the landscape, a search at Crater of Diamonds can yield both memorable finds and a deeper appreciation for natural resources.
For the most current details on hours, fees, and conditions, consult official Arkansas State Parks resources or contact park staff before your visit. This ensures that your expectations align with the latest operational policies and supports a safe, productive, and enjoyable search experience.
FAQ
Reader questions
Can beginners find diamonds at the Crater of Diamonds?
Yes, beginners regularly discover diamonds at the park. While many finds are small, the combination of accessible methods, on-site guidance, and periodic ranger demonstrations makes diamond hunting approachable for first-time visitors. Preparation, realistic expectations, and attention to safety and site rules enhance the experience.
Are equipment rentals available on-site?
Some visitors bring their own screening tools, while the park occasionally rents basic equipment near the search area. It is advisable to check availability in advance and confirm operating hours for rental services. Comfortable clothing, sun protection, and closed-toe shoes are recommended regardless of equipment choice.
How are diamonds identified and authenticated?
Visitors may use simple tests such as hardness checks and visual inspection, but professional verification is the most reliable method. The park staff or affiliated mineralogists can often provide initial assessments, and qualified gemological laboratories can issue formal certification for stones of interest. Documentation of origin may be required for appraisals and sales.
What should you do if you find a valuable diamond?
Report the find to park staff, who can document the location and provide guidance on removal and storage. For larger or potentially high-value stones, consider a professional appraisal and secure transport. Following park rules and export regulations helps ensure a smooth process and protects the integrity of the site.
Is the Crater of Diamonds site environmentally sustainable?
The park’s management plan includes periodic field rotation, soil rehabilitation, and visitor education to minimize environmental impact. By limiting access to designated areas and enforcing best practices, the site maintains its ability to support both recreation and conservation over the long term. Responsible visitor behavior is essential to this balance.