Jewelry Glossary

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    • Ablation

      Tiny scratches on faceted ridges.

    • Acetone Inspection

      Acetone inspection is an examination to confirm the presence and the degree of the gemstone's oil impregnation.

    • Actinolite

      Actinolite is a kind of amphibole, and the name which means "emission light," comes from the form of a unique crystal. Nephrite jade is a family of actinolite because it is a collection of tremolite, a group of amphiboles. Transparent actinolite stone would be a facet cut, and the opaque stone would be cut into a cabochon cut.
      [Moh's hardness: 5] [Mineral species: Actinolite]

    • Adjuster

      As the name suggests, an "adjuster" is the part of a necklace used to adjust its length.

    • Agate

      Agate is brownish chalcedony with a unique stripe pattern.
      It is produced in chunks of translucent small crystals. It can be tumbled and polished in its natural state to bring out various patterns or it is treated (dyed) to be material for jewelry.
      [Moh's hardness: 6] [Mineral species: Chalcedony]

    • Akoya Pearl

      Because akoya shellfish is small compared to other mother shells, the size of cultured pearls is also small. In Japan, the water temperature is colder than the South Sea, so the akoya shells in Japan have unique, beautiful, strong gloss. Elements to determine the value of pearls are the type of mother shell, size, shape, the thickness of pearl layer, scratch, color and the gloss on the surface. The thickness of the pearl layer needs to be more than 0.7 mm, but there are also thin layer ones to finish aquaculture in a short period. High-quality cultured pearls have fewer scratches and strong gloss. The size is about 2 to 10 mm, and the general size is about 6 to 7 mm.
      [Moh's hardness: 2.5-3] [Organic matter: Cultured pearl]"

    • Alexandrite

      The name alexandrite comes from Emperor Alexander II, who was the Romanov Prince in the Ural region of Russia in 1830.
      Alexandrite reveals different colors under various lighting conditions because of its chromium content. In the sunlight, it’s a deep blue green. By candlelight, it looks purplish-red. Lower quality stones will demonstrate lesser color changes, sufficient transparency is another indicator of quality.

      Crescent Vert alexandrite possesses the same vivid color-changing properties as high-grade natural stones from Russia’s Ural Mountains.

      Please click

      to learn more about Kyocera's Crescent Vert alexandrite.

      [Moh's hardness: 8] [Mineral species: Chrysoberyl]

    • Alexandrite Cat's Eye

      Alexandrite and cat's eye are the same mineral.
      To the untrained eye the two might not seem to be the same mineral because of the differences in their appearance and effects. However, alexandrite cat's eye shows both the color-change effect and the cat's eye effect at the same time.
      [Moh's hardness: 8] [Mineral species: Chrysoberyl]

    • Alloy Metals

      Pure silver, pure gold, and pure platinum are too soft to be used for jewelry, so other metals are mixed to make silver/gold/platinum alloys. The other metals are alloy metals.

    • Almandite Garnet

      Almandite garnet is a gem in the garnet group. Its name is derived from Alabanda (now Alafsar) a city in Turkey where this mineral has been mined for a long time. It features a pinkish red color compared to pyrope.
      It may also be included as an inclusion in diamond.
      [Moh's hardness: 7] [Mineral species: Almandite garnet]

    • Amazonite

      The mineral amazonite is microcline used as ceramic raw materials and abrasives. Blue-green microcline containing leads is sold as amazonite at the market. It is named from the Amazon River image in South America but is not produced near that area. It is a vulnerable stone to shocks and sudden temperature changes because of its strong cleavage.
      [Moh's hardness: 6] [Mineral species: Microcline]

    • Amber

      Amber is mainly polished to beads and cabochons. The barrel shape and olive shape design brings unique attractiveness to amber. The main color of amber is brownish yellow and cognac color, but recently, transparent lemon color is also popular. Amber has a unique beauty like candy, and it is good to choose any color you like because its value does not depend on colors.
      [Moh's hardness: 2-2.5] [organic matter: Amber]"

    • American Type Earrings

      The "American type" has a post at the end of the chain, and the chain is inserted into the piercing hole along with the post, allowing the two ends of the earring to hang down. They are also called "American earrings." It is said that the name derives from the fact that Native Americans wore these earrings. These earrings do not have catches.

    • Amethyst

      Purple crystals are called amethyst within the quartz family. In ancient Greece, it was an amulet to prevent drunkenness. Sought after characteristics include color depth, transparency level, color evenness and scratches visible to the naked eye. Some amethysts are irradiated to improve their appearance.
      [Moh's hardness: 7] [Mineral species: Quartz]

    • Andalusite

      Andalusite is derived from Andalusia, Spain where the gem was produced. The gem is hard enough to be a wearable gemstone. Because of its pleochroism, change of color by light can be seen and it is similar to some alexandrite with weak color change.
      [Moh's hardness: 7] [Mineral species: Andalusite]

    • Andradite Garnet

      Andradite is called "Topazolite" if it features a yellow coloration because of its resemblance to topaz. Green andraite are called "Demantoid," and black andraite is called "Melanite."
      The level of dispersion of the andradite is stronger than diamond (0.054) at 0.057.
      [Moh's hardness: 7] [Mineral species: Andradite garnet]

    • Anklet

      An anklet is jewelry worn around the ankle. The mainstream styles are simple chains or chains with a small charm, so sometimes anklets are called leg chains. The average length of the chain is about 22cm.

    • Annealing

      Annealing is a heat treatment that lowers hardness. Through jewelry production, annealing is conducted many times. In particular, annealing needs to be done for K18, which has high vickers hardness.

    • Apatite

      Apatite is a mineral resource of phosphorus such as match. It was named "Apate," which means betrayal in Greek. Apatite is transparent and shiny, and it has a wide color variation. It is often finished with a facet cut.
      [Moh's hardness: 5] [Mineral species: Apatite]

    • Aquamarine

      The word "Aquamarine" comes from "Aqua" meaning water and "Marine" meaning sea in Latin.
      It features light blue colors calling to mind clean and cool water. In the past, it was called "mermaid tears" and "treasure of the sea spirit," it was worn as a voyage amulet by sailors. Some aquamarine is already blue and brownish when it is collected, while others bring out the color by heating a pale green and brownish one.
      [Moh's hardness: 7] [Mineral species: Beryl]

    • Aragonite

      Aragonite is a calcium carbonate mineral, same as calcite. Biological activities also generate it. Pearls and shells are also made of aragonite. After the shell loses their life, it changes to a stable calcite.
      [Moh's hardness: 3.5-4] [Mineral species: Aragonite]

    • Armlet

      A bracelet is jewelry worn around the wrist, and an armlet is jewelry worn around the upper arm. A popular armlet style is a bangle-like horseshoe design.

    • Asterhythm

      Asterhythm is also called the star effect, which is the appearance of six stars on the cabochon-cut gemstones when illuminated.

    • Automatically Programed Cutting

      Automatically programed cutting is a method of processing wax prototypes for jewelry with cutting machines for wax. Computer-designed 3D design data and cutting machines are linked together, automatically creating hard wax prototypes.

    • Aventurescence

      Aventurescence is a pattern of brilliant flashes caused by inclusions in minerals such as some quartz.

    • Aventurine Quartz

      Aventurine quartz is named as such because the glow of small grains is similar to aventurine glass.
      Many colors such as brown, reddish brown, yellow, green, blue green color are produced. Micro crystals arranged in a certain direction make the brilliance look like gold powder.
      [Moh's hardness: 7] [Mineral species: Quartz]

    • Axinite

      It is named after its dolabriform (shaped like the head of an axe) crystals. Generally, its color is transparent brown, but also violet ones exist. Typically there are many scratches on the surface, it is mainly a collector's item. It may be confused with "Smokey quartz" because the color and shape are similar.
      [Moh's hardness: 6] [Mineral species: Axinite]

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