Jewelry Glossary

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  • G

    • Garnet

      Garnet is a group of minerals which have an isometric crystal system and similar chemical compositions. It can be roughly divided into two types: aluminum garnet and calcium garnet. Garnet produces colors such as orange, yellow and green, but not blue and violet.

    • Gemstone

      There are over 4,000 mineral species on earth, but only 40 to 50 species are used for jewelry.
      To be named a gem, the color and brilliance of the mineral must be beautiful. Additionally, it is necessary to have a hardness that is not easily scratched or blemished as jewelry, or durability that does not discolor even if it is used for a long time. A mineral that meets these requirements and is rare is called a gemstone.

    • Girdle

      The girdle is a boundary between the crown and pavilion. The widest part of a gemstone when viewed from the top. Please kindly refer to the image of the brilliant cut for details.

    • Gold

      Gold is mainly produced in South Africa, Russia, the United States, and Canada. It is the most malleable and ductile metal among all metals. Also, it is resistant to corrosion and tends to keep its luster.

      Pure/fine gold is not suitable for jewelry as it is too soft. So, people usually make gold alloys by mixing silver and copper, but the color of gold changes a lot depending on the rate of the metals.

    • Grain

      A grain is a unit for pearl weight. One grain is equal to 0.25ct.
      However, this weight unit is used only in transactions between vendors, and "mm" which indicates the diameter, is usually used in the general marketplace.

    • Green Tourmaline

      Green tourmaline has a wide range of coloration from yellow green to bluish green. A beautiful green like emerald was sometimes produced, it was commonly confused with emeralds until the 18th century. Lighter green stones are considered to be of higher value than darker samples.
      [Moh's hardness: 7] [Mineral species: Tourmaline]

    • Grossularite Garnet

      Grossularite is known to be colorless, yellow, and brown color besides green. It takes its name from grossularia which is the scientific name of gooseberry. The hessonite of reddish brown is also a kind of grossularite.
      [Moh's hardness: 7] [Mineral species: Grossularite garnet]

    • Gypsy Mounting Ring

      A gypsy mounting ring is an arranged domed band ring with a voluminous top portion. This ring type is normally produced by lost-wax casting.

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