Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
Found in nearly every color – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness.
Ruby and sapphire (usually blue, but also in every other color) have been the most important colored gemstones for several thousand years. Originating historically in southeast and central Asia, and more recently in eastern Africa, these colored varieties of the mineral corundum have been much sought as gems because of their rarity, color and durability. Gem corundum can display asterism and chatoyancy due to the presence of oriented mineral inclusions, and in some cases, a change of color when viewed under different light sources.
Review of Walter Schumann's Gemstones of the World.
GIA’s postdoctoral program gives researchers access to gemological data, equipment and rare, unusual and large gems in its laboratories.
Amber has been found in various parts of the world, but the main historical source is the land that surrounds the Baltic Sea.
A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.
Learn more about pearl species, localities, and growth, along with definitions for the 7 Pearl Value Factors™ and terminology GIA uses to describe your pearl.
Their jewelry has won multiple design awards – and the attention of Katy Perry, Miranda Lambert, Gabrielle Union, Kristen Stewart and Kylie Jenner, to name a few.