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denver gem show - gems on display
Denver Gem & Mineral Showcase 2017

With over 900 vendors and numerous geologic rarities, the 2017 Denver Gem & Mineral Showcase had plenty to see. Read about some highlights in our report!

agate buying - dendritic agate bracelet with pearls
Agate Buying Guide

Decorative, patterned forms of agate are excellent natural gems. Learn more about agate's mesmerizing patterns in our agate buying guide!

quartz with inclusions - mechanical gemstone cleaning
Mechanical Gemstone Cleaning

Mechanical gemstone cleaning has benefits and risks. Learn all about ultrasonic, steam, and boiling systems and how gems might react to them.

Ametrine - Bolivia 24.64 cts
Ametrine Value, Price, and Jewelry Information

Everything you ever wanted to know about ametrine. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.

Colorado gemstones - rhodochrosite pendant
A Visitor’s Guide to Colorado Gemstones

Colorado has a lot to offer gemologists and rock hunters. Before you visit, learn about Colorado gemstones as well as notable gem shows, museums, and clubs.

amethyst buying guide - earrings
Amethyst Buying Guide

Long valued for its purple color and symbolic associations, amethyst is a versatile gem. Our amethyst buying guide can help you pick an excellent stone.

molecule model - gemological formulas
Understanding Gemological Formulas

Gemological formulas identify the chemical composition of gems and minerals. Learn what the symbols, numbers, and parentheses mean.

citrine - faceted stone
Citrine Value, Price, and Jewelry Information

Everything you ever wanted to know about citrine. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.

gemstone transparency - carnelian
What Is Gemstone Transparency?

Gemstone transparency describes how much light passes through a gem and how it scatters. Learn what causes a gem to be opaque, translucent, or transparent.

gemstone luminescence
What is Gemstone Luminescence?

Gemstone luminescence is a glow that occurs when certain stones are subjected to energy such as UV light. This effect can help gemologists identify gems.

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