Mechanical gemstone cleaning has benefits and risks. Learn all about ultrasonic, steam, and boiling systems and how gems might react to them.
Everything you ever wanted to know about ametrine. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
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.
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.
Gemological formulas identify the chemical composition of gems and minerals. Learn what the symbols, numbers, and parentheses mean.
Everything you ever wanted to know about citrine. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
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 is a glow that occurs when certain stones are subjected to energy such as UV light. This effect can help gemologists identify gems.
Whether you're new to faceting or an old pro, these quartz polishing survey results can help you choose a lap, polish, and lubricant combo for your gem.
Long associated with preventing drunkenness, amethyst has other purported spiritual and protective powers. Learn more about amethyst symbolism and lore.