💎 Aquamarine – The Official State Gemstone of Colorado

By Open Road Colorado | Colorado Geology & Fun Facts
Updated April 2025 | Great for Students, Rockhounds & Gem Collectors

🏔️ What Is Aquamarine?

Aquamarine is a semi-rare, blue to blue-green gemstone belonging to the beryl family, the same group that includes emerald. Its name means “water of the sea” in Latin, and it gets its color from iron trapped in its crystal structure.

In Colorado, aquamarine is found high in the **Sawatch Range**, especially near Mount Antero (14,276 ft) and Mount White. These alpine peaks are home to some of the highest gemstone mines in North America.

📜 When Did Aquamarine Become Colorado’s State Gem?

Aquamarine became the official state gemstone of Colorado in 1971, through House Bill 1104. It is codified in the Colorado Revised Statutes §24-80-912 and recognized by the Colorado State Archives.

It was selected for its:

• High quality and abundance in Colorado
• Unique alpine formation conditions
• Symbolism of Colorado’s clean mountain air and sky
• Appeal to jewelers, collectors, and geology students

🧭 Where to Find Aquamarine in Colorado

The most famous aquamarine deposits in Colorado are found in the rugged alpine regions of:

• Mount Antero
• Mount White
• Chalk Creek Mining District in Chaffee County

These areas sit at elevations between 12,000 and 14,000 feet. Access is typically by 4×4 vehicles, hiking, or guided tours. Many sites are on private mining claims or USFS land, so always check access rights before attempting to collect.

🗺️ Additional Aquamarine Locations Around Colorado

Beyond Mount Antero, aquamarine has been found in smaller quantities in other high-elevation pegmatite zones across Colorado, including:

• Saint Kevin Gulch near Leadville
• Tincup Pass area west of Buena Vista
• Hancock Pass trails and slopes
• South Cottonwood Creek areas in the Collegiate Peaks

Although these secondary sites are less famous than Antero, they’re great for rockhounding, especially for beginners looking for quartz, feldspar, and occasional beryl finds.

🌍 Where Else Is Aquamarine Found Globally?

Though Colorado aquamarine is unique, similar deposits can be found in:

• Brazil – the largest commercial exporter of aquamarine
• Nigeria – known for vibrant blue crystals
• Madagascar – greenish aquamarine varieties
• Pakistan and Nepal – Himalayan high-elevation sources
• Russia, Colombia, and parts of the United States

What makes Colorado’s aquamarine special is its formation in **granite pegmatite** veins at extreme elevations—conditions not found in most mining regions.

💎 Fun Facts About Aquamarine

• 🔷 Aquamarine is the birthstone for March.
• 🧊 On the Mohs hardness scale, it ranks 7.5 to 8—great for jewelry.
• ✨ Colorado crystals can grow over 6 inches long and are highly collectible.
• ⛏️ It’s typically found in “vugs”—hollow pockets inside rocks lined with crystals.
• 🔥 Heat-treating aquamarine can deepen its blue tone—some jewelers use this process to enhance color.

📚 Student FAQ – Aquamarine Edition

Why was aquamarine chosen as Colorado’s gemstone?
It’s beautiful, locally sourced, historically significant, and symbolizes Colorado’s alpine scenery.

Can I mine aquamarine in Colorado?
Yes—with proper permission. Much of the land is either private property or under mineral claim. Public areas may allow recreational panning or rockhounding—always check with the U.S. Forest Service (PSICC).

How much is aquamarine worth?
High-quality specimens from Colorado can sell for $20 to $500+ per carat, depending on clarity, size, and color intensity.

What’s the difference between aquamarine and emerald?
Both are types of beryl. Emerald is green (due to chromium), while aquamarine is blue or blue-green (due to iron).