Everything you ever wanted to know about glass gemstones. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
Some gems have an appeal beyond their appearance. If you’re looking for a gem with a story to tell, try these unique gem materials for jewelry design.
Decorative, patterned forms of agate are excellent natural gems. Learn more about agate's mesmerizing patterns in our agate buying guide!
Gemstone cleavage is a break in a crystal along internal planes. Learn the science behind this and the difference between cleavage, fracture, and parting.
Everything you ever wanted to know about obsidian gems. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
Uranium glass, or Vaseline glass, is a prized collector's item and is generally safe to handle. But is it safe to facet? Learn about the potential risks.
An overview on Tektite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Tektite gemstones.
An overview on Gypsum Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Gypsum gemstones.
Natural glasses have the same bubbles and swirl lines of man made glass. Its optical and physical properties are the same as untreated glass.
A rare glass, always a pure blue with medium to deep tone. Typical glass inclusions, bubbles and swirl marks. Extraordinary hardness for glass at 6.5.