Founded in 1964, the Denver Gem and Mineral Guild is an award-winning non-profit organization that pursues exploration, experimentation, and education in the Earth Sciences; the discovery, development, and preservation of minerals and mineral deposits; and the advancement, encouragement, and utilization of the principles of art and craftsmanship, as applied to gems and minerals.  We are a diverse group of women, men, and children who love ROCKS. We love to dig them, cut them for jewelry, and collect them. Our members love to share our passion for rocks and minerals. We have professional geologists, teachers, lapidary artists, and people who just love rocks.

We meet the 2nd Friday of the month – September through May at the Wheat Ridge United Methodist Church, 7530 W. 38th Ave, Wheat Ridge CO at 7pm – VISITORS WELCOME!  – CLICK HERE for details.
NOTE: Due to Covid (or snow) some meetings may be held via Zoom instead of at the Church – always check below for the latest schedule details!

January 2023 Events Held

Friday, January 13th, 7 p.m. DGMG Monthly Meeting
at Wheat Ridge United Methodist Church, 38th & Vance
featuring – Jim Profitt – Light, Color, and Pretty Rocks! 

Photo of Jim Profitt
Jim Profitt

Our interest in rocks and minerals has many causes, but appearance is one that must have been recognized by the earliest of humans. The variety of color within and between rock types is rooted in physical structure, physics, and chemistry, but we can get a good feeling for why light behaves the way it does without getting into high-level science. So we’ll look at the basics of the dance of energy between light’s photons and an atom’s circulating electrons (no math), why this causes color, and also explain why we can even see color. Then, it’s on to pretty rocks: what has happened to light as it bounced off, or went through that lovely specimen our lucky foot kicked up?

Jim retired from Siemens Medical Diagnostics at the Senior Staff Scientist level about 10 years ago. He started chemistry work as a medicinal chemist and moved into diagnostics, spending a lot of time working with light and color. Over the decades he has accumulated dozens of US patents with himself and others as inventor. Presently he works on invention, just because he cannot stop, using SolidWorks for 3D design and a combination of laser cutting and 3D printing to work out ideas. Recently, he has started oil painting as part of a return to art interests.
Come learn why minerals have color!!!

2023 Calendar

2023 calendars are available, less than 20 left! $10 for the beautiful production by club members! Proceeds go to the scholarship fund. (Members can take a look at previous year calendars here.)

More Upcoming Events:

March 10: DGMG Meeting: Dan Zellner, Minerals of Searles Lake, CA

April 14: DGMG Meeting: Dennis Gertenbach, Lithium: Where does it Come From?

June 24: Fieldtrip: Harris Park with Lake George GMC

September 23: Fieldtrip: Wigwam Creek with Lake George GMC

February 2023 Events Scheduled

Friday, February 10th, 7 p.m. DGMG Monthly Meeting
Dr. Pete Modreski – Live report from the Tuscon Show

This meeting will be Zoom only.
We will NOT meet at the church in February !!


The largest, oldest and most prestigious gem and mineral show in the world.The Tucson Gem and Mineral Show® has enjoyed international stature since the 1970s, and was the first gem and mineral show to bring the hobby enthusiast, the public, and the curator/professionals together for discovery and discussion. Come hear Pete’s report on what’s new at this year’s show!

Friday – Sunday, February 24-26
DGMG Jewlry, Gem & Mineral Show !!!

Jefferson County Fairgrounds
15200 West 6th Avenue,  Golden, CO 80401

Free Parking & Free Admission

Fun for the whole family, with geode cracking, beautiful minerals from around the world, (and meteorites from around the solar system) ancient fossils, fluorescent room with rocks that glow in the dark, gems, opals, magnificent hand-crafted custom jewelry and more. 

Watch skilled lapidary artists cut gems and create beautiful polished stones. Talk with area rockhounds to learn about local field trips and collecting opportunities.  Over 20 educational displays from; The Sherman-Dugan Geological Museum, Dinosaur Ridge, and more. Vote for your favorite display and enter to win prizes. Show Special – $1.00 Grab Bags – kids, jump start your collection with 8 minerals plus a chance to win special prizes.

For more information please visit our Show Page:

Members! Sign up to volunteer—we need all the help we can get!

Join the fun

Join the Denver Gem & Mineral Guild!

The Denver Gem & Mineral Guild is a member of:

The Greater Denver Area Gem and Mineral Council, Inc., host of the Denver Gem & Mineral Show™, is a non-profit 501(c)(3) corporation organized exclusively for charitable, educational, and scientific purposes. Trustees from each of our six member clubs sit on the Council Board. The Council oversees the annual show, and twice each year, the Council distributes proceeds from the show in the form of grants to not-for-profit organizations, particularly those based in Colorado, to promote activities that educate the public in the earth sciences.

Annual giving ranges from $20,000 to $30,000. Funds are directed toward site and specimen preservation and display efforts, as well as to assist institutions in purchasing equipment, tools, and supplies. Recent grant recipients have included the Denver Museum of Nature and ScienceColorado School of Mines Geology MuseumDinosaur RidgeMorrison Natural History Museum FoundationHinsdale County Historical SocietyCanyon City Geology ClubBig Horn Basin Foundation, and the Junior Museum of Pennsylvania.

The Rocky Mountain Federation of Mineralogical Societies has a close association with all the clubs in the Society to promote the study of earth sciences, including the lapidary arts, the study of fossils and paleontology, and related crafts.

The RMFMS was organized in 1941, and held its first annual convention at the Argonaut Hotel in Denver, Colorado. There were 16 organizations in attendance. The RMFMS became one of the original four founders of the American Federation of Mineralogical Societies when it was organized in 1947.

The Rocky Mountain Federation of Mineralogical Societies covers local clubs in the following states:

Arizona (17), Arkansas (1), Colorado (20), Kansas (5), Nebraska (western portion of state) (1), New Mexico (7), Nevada (1), North Dakota (western portion of state)(1), Oklahoma (9), South Dakota (western portion of state) (1), Texas (1), Utah (7) and Wyoming (7).

The American Federation of Mineralogical Societies promotes popular interest and education in the various Earth Sciences, and in particular the subjects of Geology, Mineralogy, Paleontology, Lapidary and other related subjects and sponsors and provides means of coordinating the work and efforts of all persons and groups interested therein. It sponsors and encourages the formation and international development of Societies and Regional Federations and by and through such means to strive toward greater international good will and fellowship.

The American Federation of Mineralogical Societies is composed of the following seven similar regional organizations of gem, mineral, and lapidary societies.  CFMS – California Federation of Mineralogical Societies | EFMLS – Eastern Federation of Mineralogical and Lapidary Societies | MWF – Midwest Federation of Mineralogical and Geological Societies |  NFMS – Northwest Federation of Mineralogical Societies |  RMFMS – Rocky Mountain Federation of Mineralogical Societies |  SCFMS – South Central Federation of Mineral Societies
 |  SFMS – Southeast Federation of Mineralogical Societies

This page last updated on  1/18/2023