Denver Gem & Mineral Guild

February Show Dates

Jefferson County Fairgrounds, 15200 W 6th Avenue, GoldenCO 80401     (DIRECTIONS)


Visit the Bat Cave (Fluorescent Room) and see rocks that glow in the dark!

A Brief History of Fluorescence and Phosphorescence before the Emergence of Quantum Theory By Bernard Valeur and Mario N. Berberan-Santos, Journal of Chemical Education

Photoluminescence, the emission of light arising from excited electronic states following absorption of light, is important in many scientific and technological fields, namely, physics, chemistry, materials science, biology, and medicine. Many important applications based on photoluminescence have been developed, such as fluorescence microscopy, fluorescent tubes and lamps, optical brighteners, plasma screens, forensics, tracers in hydrogeology, fluorescent and phosphorescent paints, phosphorescent labels, safety signs, and counterfeit detection . . . (continue reading)

Lapidary Fundamentals: All About Gemstone Faceting from

There is more to a gemstone than sparkle and shimmer. A diligent effort goes into fine-tuning and adjusting the gem before it enters the marketplace. Gemstone faceting is the trick of the trade and requires years of practice to master. Combining an art form with strategic engineering, the process of gemstone faceting is not one for the weak of heart. To successfully understand the processes involved in gemstone faceting, it helps to study, practice, and apprentice under an expert. As a lapidary, there are many fundamental lessons you must learn to excel at the . . . (continue reading)

Lapidary Fundamentals: Cabochon Cutting by Donald Clark, International Gem Society

Cabochon cutting or cabbing is the most popular form of gem cutting. Although it requires a fair amount of skill, almost anyone can master this technique. Rough material for cabbing can be found or purchased inexpensively. Many people never buy their rough and are content to cut the many stones they trade for or find. Of course, as you gain experience, you can if you wish move on to more valuable materials like turquoise, lapis lazuli, and even phenomenal stones like cat’s eye chrysoberyl and black opal.  (continue reading)

Door Prizes!

Everyone will receive a ticket at the door that will enter them to win prizes. Drawings are held hourly, you must be present to win.

Geode Cutting

Be the first in the world to see what’s inside of these geodes! What are geodes? Where do they come from? What are the crystals inside? Watch this video to find out, then come to the show and see these wonders for yourself!

Mineral Identification

Ever wondered the name of that certain rock/mineral in your collection?  Bring it to the show and our experts will work to help you identify it!

Beautiful and Educational Displays

This year’s show will feature over 20 beautiful and educational displays from the Sherman Dugan Museum, The Denver Museum of Nature and Science, and rarely-seen specimens from notable private collectors.

You can vote for your favorite case to be awarded the coveted Peoples Choice Award.

Your vote will also enter you into a drawing to win great prizes!

Grab Bags

Kids! Jumpstart your collection with a grab bag.  Each bag contains 8 labeled mineral specimens. 
Then take your minerals to the Bat Cave (fluorescent room) to see if any of them glow.

Grab bag


Live Gold Panning Demonstration by the Phoenix Mine

Come to the show to get a lesson on how to pan for gold from the experts at the Phoenix Gold Mine!

Then check our handy guide on where to pan for gold in Colorado and start panning for real gold!


Colorado Meteorites!

Did you miss the fireball over Arvada CO?
Don’t miss this rare opportunity to see several Colorado meteorites!

Did you know that Colorado was one of the first places where meteorites were seriously studied? Over 75 meteorites have been found here and this weekend will offer you an opportunity to see several of them. This display by Gary Curtiss and the Colorado Meteorite Society will include several samples from private collections that are rarely available for viewing by the public. Samples will include:

The Johnstown Meteorite

In 1924 a meteorite fell over Johnstown. Some people thought it was the end of the world because of the sulfur smell and the sonic boom. Some people at a local funeral saw it fall and create a crater. they went to dig it up. Read more . . .

Johnstown Meteorite fell from the sky 90 years ago – Loveland Reporter-Herald

The Bear Creek Meteorite

The Bear Creek Meteorite was found along Bear Creek just west of Morrison Colorado on  April 18, 1866 by George Morrison, a stonecutter from Scotland, and James L. Wilson. (It was George Morrison who conceived and developed the town now known as Morrison Colorado).  It weighed 500 pounds! It has since been cut into smaller pieces and widely distributed.

Tale of the Bear Creek Meteorite by Matthew Morgan & Gary Curtiss – The Bear Creek Meteorite

The Meteoritical Society – Bear Creek

The Bear Creek Meteorite – YouTube – Matthew Morgan (Colorado Geologic Survey) & Gary Curtis (Colorado Meteorite Society)


When were Meteorites first discovered/recognized

Souvenirs from the Sky – The Denver Post

The Oldest Thing in Colorado – Front Porch

Fireball over Arvada CO, February 18, 2022. YouTube video by Simon Foot

Gary Curtiss from the Colorado Meteorite Society discusses Colorado Meteorites. See his display of actual Colorado Meteorites at the show!


DanZ Rockshop – Dan Zellner

My name is Dan Zellner and selling minerals is my life’s passion / obsession. My goal is to provide quality minerals at affordable prices. My selection of minerals ranges from USA classics, new worldwide finds, historic mines, oddities, fluorescents, and simply aesthetic pieces. I have been selling minerals online and at shows for over 10 years.

My academic background includes a Masters in Mining Engineering from the Colorado School of Mines and an undergraduate degree in Chemistry with a minor in Geology from UC Santa Barbara. I have worked as an engineer designing underground construction projects and mines around the world.

My passion for minerals led me to become a full-time mineral dealer in 2021. I have always loved meeting new people, seeing new collections, and learning more about minerals.

Studio 67 – Patti Harrison

I have been professionally painting for 20+ years and silversmithing for 10+ years. My work is currently sold in 4 galleries in Colorado. Sterling silver is my primary metal, but I also enamel copper and anodize titanium and niobium. I create pieces using faceted gem stones, cabs and/or freshwater pearls. My designs are originated around the gem stones; each piece is a new creation. The gem stone dictates my use of texturing, forging, fusing, etc.

My display will include a wide variety of processes. Earrings will include open spiculum form, textured, enameled or gold fused on silver; a versatile earring; the stud can be worn by itself, with the dangle back or the dangle back can be worn with a different stud. Blue patinaed copper (sealed), “see through” Blue topaz in ice resin set in sterling bezels, crushed opal inlay, titanium, a variety of styles with high quality Sea Pearl and Freshwater pearl earrings. Pendants with the back plates cast from shed tree bark, pendants designed with square wire, cast rings and fused silver on silver rings.

Costigan’s Minerals West

Costigan’s/rockman69 has been eBay’s premier source of high-quality rough rock since 1998. Add me to your saved seller’s list and join my email distribution as I have frequent sales. I would love to be your online resource for worldwide cutting material. ROCK ON!!

The Amethyst Rose

In business since 1989, we’re a lapidary and have custom-cut fine gems from all over the world. We also manufacture elegant wire-wrapped jewelry.

Self A Ware Minerals

Jeff Self and his wife, Donna Ware,  spend as much time as possible in the field, digging on their mining claims that are scattered across Colorado. They recover fine specimens of Aquamarine, Phenakite, Fluorite, etc., from Mount Antero ( where they have been working for 25 years ). Amazonite, Smoky Quartz, Fluorite, etc., from the Crystal Peak area. Topaz from the Tarryall Mountains near Pilot Peak. Jeff and Donna have some of their best specimens on loan to the Colorado School of Mines Mineral Museum in Golden, Colorado.  

And check out this interview with Jeff Self and Donna Ware by Ryan Warner for Colorado Public Radio (1/2/2014).

At the show, you can expect them to offer fine mineral specimens, meteorites, tektites, gold, and mining memorabilia.

JBL Minerals

Fine mineral specimens.

Jensen Meteorites

Books,  Meteorites, and Tektites!


meteorite is a solid piece of debris from an object, such as a cometasteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon  – Wikipedia

Tektites (from Ancient Greek τηκτός (tēktós) ‘molten’) are gravel-sized bodies composed of black, green, brown, or gray natural glass formed from terrestrial debris ejected during meteorite impacts. – Wikipedia

D & J Rare Gems

D&J Rare Gems was founded by Donna and John Rhoads in 1985 as a source for rare gems for the gemologist and collector. Initially a mail order company for rare gems, D&Rare Gems expanded into fine gems in 1988. Lapidary services were added in 1989, providing well cut fine and rare gems to the industry. In 1990 we opened our retail jewelry store in Salida, Colorado offering fine jewelry, wholesale gemstones, and mineral and crystals to the public as well as gemstone cutting and repair.

We moved to 112 F Street in Salida in June of 1992. Full casting capabilities were added in February 1996 making us one of the most complete service jewelry and gem store anywhere.

During October of 2005, John Rhoads attended the extension courses required for his Graduate Gemologist diploma through the Gemological Institute of America. He is now a G.G. as the result of his success in completing these courses.

Prairie Gems Jewelry – Vickie Schlepp

Offering beautiful hand crafted wirewrapped jewelry.

Beauty and the Beads – Beverly Pfeifer

Beverly creates beautiful handcrafted necklaces. Special orders are welcome.

She also sells whimsical earrings, many with a science fiction or fantasy theme.

See her at the DGMG Show!

Robert Stoffer Minerals

Beautiful minerals hand mined by Robert himself from Ouray Colorado.

Dave Sanchez

Dave Sanchez has exhibited at our show before and this will be his third year as a dealer with us. Dave creates exquisite hand-crafted items which you can see in this video. Come check out Dave’s work in person at this year’s show!

Earthstones – the Solitaire

Our mission is to search the gem dealers of the world to bring the newest cuts, the most usual stones, and other interesting finds to our customers. These loose stones can be purchased for their beauty or put into stunning pieces of jewelry.

K & M Enterprises

K&M Enterprises is a long-time fixture at our show. They offer jewelry, minerals, faceted stones, cabbed stones, plastic stands, slabs, and more.

Orca Gems

For over 30 years, I have been cutting and selling opals; from most of the world’s sources. I make a collecting trip every year to Virgin Valley Nevada, and have done quite well there at all of the fee dig mines!  With my wife Trudy, I show at  10 or so gem & mineral shows, mainly in Colorado and the neighboring states; see our events page.  We are excited to now offer jewelry with opals inlayed in epoxy resin: Ear Gauges, Earrings, and Pendants. We ship free in the US, and offer a no hassle full refund on anything returned to us, for any reason… Thanks for stopping in!
Sandy & Trudy Craig

Crystals Unlimited

Beads, Jewelry, Carvings, Minerals and more!

Morocco’s Fossils

Morocco’s Fossils is another long-time fixture at the DGMS Show. They offer beautiful moroccan fossils both as showpieces and carved into more practical items like dishes.

Morgan Trinkets

We specialize in quality jewelry and pottery at reasonable prices, estate gold..(small amount but top quality!)
We are 90% American-made.
Our motto is buy American!
Our pottery is by award-winning native American artists!

Sidewinder Enterprises – Bill Jones

I left the oil & gas industry to start my own business in 2010. I buy and sell rocks and fossils as Sidewinder Minerals. I travel around the country to sell at various gem & mineral shows. I average 15-17 shows per year (except for 2020!). I sell online at

Rocky Mountain Mining Company

 I have been buying and selling antiques and collectibles in the Denver area for over 30 years. I started out collecting McCoy pottery. My first piece was the cowboy boot vase. I grew up on a big ranch with world-class Quarter Horses. I know a little about most antiques and collectibles and am always on the lookout for the rare and unusual. I am also slowly curating my many collections. I have always enjoyed the business because it is an opportunity to learn something new, about something else, every day.  The most important thing to me is to have happy customers.

Down to Earth Rockshop

Down to Earth Rock Shop is a family-owned business that offers unique collectible items. Established in 2017 by Donna & Mark McMahon 
Donna & Mark source, cut, and polish all the stones we carry.  
Lapidary and rock collecting are some of the many hobbies we all enjoy doing together.
We carry a wide variety of original products made from quality materials.


Rockhound Studio – Bob Pfeifer

Bob offers geodes, geode cracking, and whimsical creatures that he creates from stone.

Blackstone Lapidary

Blackstone Lapidary specializes in lapidary slabs. Lapidary slabs are unpolished rock slabs that are used for numerous projects such as making cabochons.

Chris Van Cleave – Van Cleave’s Minerals & Gems

This will be Chris’ second year as a dealer at our show. Check out his work online, then see him live at the show!

Ebay – vancleavesminerals

Wisdom Tree

Mia offers a great selection of Rocks and Crystals for people and pets.

Queen Makda Gems – Tadesse Brhane

Ethiopian Opal – A Gemstone that exudes a mesmerizing play of colors, where every gemstone tells of its own.
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The show is INDOORS in the Exhibit Hall

NO pets please (except for certified service animals)


For additional information, visit the DGMG Jewelry Gem & Mineral Show Facebook page.


We have limited space and all booths are booked for our 2025 show, with a long waiting list. If you would like to get on the list for future years please contact MineralGuild@Gmail.Com

THANK YOU! To all of these organizations who are helping to spread the word about our show!

EVENTBRITE –    a global platform for finding events –
2024 Show URL:

CITYSPARK – provides data to various websites including the Denver Post
2024 Show URL:!/details/Denver-Gem-and-Mineral-Guild-Gem-and-Mineral-Show/12008995/2024-02-23T10

CRAIGSLIST – Events Section –
2024 Show URL:

VISITGOLDEN – promotes Golden CO –
2024 Show URL:

WIKIDO – A national site for events –
2024 Show URL

NEXTDOOR –   a popular neighborhood site –
2024 Show URL:

FOX 31 /!/
2024 Show URL!/details/Denver-Gem-and-Mineral-Guild-Gem-and-Mineral-Show/12008995/2024-02-23T10

DENVER.ORG /   –   events in metro Denver –
2024 Show URL

10 Times – worldwide listing of shows –
2024 Show URL: -Celebrating two decades of uncovering the culture of Denver –
2024 Show URL:

MILE HIGH ON THE CHEAP – #1 “Guide to Frugal Fun in Denver/Boulder –
2024 Show URL:

FACEBOOK EVENTS – FB listing of local events       
2024 Show URL:

FESTIVALNET – serving the festival community –
2024 Show URL:,-Gem-Mineral-Show

UPCOMING EVENTS – promotes dozens of the very best live
2024 Show URL

Rock & Gem Magazine – serving the needs and goals of anyone with an interest in rocks –
2024 Show URL:

 2024 Show URL

KIDS OUT AND ABOUT – activities & resources for kids –
2024 Show URL:

ROCK AND MINERAL SHOWS.COM – Your source for Rock and Mineral Shows, Clubs, Rock Shops, Mineral Museums
2024 Show URL:

JEFFERSON COUNTY FAIRGROUNDS – Jeffco’s best venue for Youth, Agriculture & Equine
2024 Show URL:


Thank You Gif

Stock Jam

This page last updated 3/3/2024

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