Citrine 

Ouro Verde quartz, also known as lemon quartz, is a popular treated stone. Learn how experiments with other gems led to the development of this treatment.…

Gemstone heat treatments can increase the beauty and value of many rough pieces. Learn how to conduct the most common procedures safely.

Have you fallen in love with garnets? This versatile gemstone is a favorite among jewelers and gemologists, with a range of colors that few gems…

Rarely does a gemstone have popular associations with multiple colors. Traditionally, topaz was favored as a golden yellow stone. Nowadays,…

Topaz makes an excellent jewelry stone. It comes in a wide range of colors — and prices — to complement any outfit and style. Our topaz buying…

Our topaz buying guide can help you learn how topazes are graded, what to avoid, and how to identify a high-quality stone or a bargain in the rough.…

Topaz is a semiprecious gemstone made of aluminum and fluorine. Although frequently associated with golden yellow and blue, it can be found in…

Gemstone scratch testing can help determine the Mohs hardness value of a mineral sample. Learn how to conduct this destructive gem test safely.…

How do you say “love me” with a stone? Learn about lapis lazuli symbolism and legends. This beautiful blue mineral has fascinated people for…