Jewelry Glossary

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    • Danburite

      Danburite derives its name from the place where it was first found in Danbury, Connecticut, United States in 1830. Cut stones of high quality are more transparent than crystals and topaz so it was once used as a diamond imitation. Danburite is suitable for facet cut because it doesn't have a strong cleavage nature.
      [Moh's hardness: 7] [Mineral species: Danburite]

    • Demantoid Garnet

      Demantoid garnet has been mined in the Russian Ural Mountains since the 1860s. Currently, it is also produced in Namibia and Madagascar, but the demantoid garnets mined in Russia good reputation for their quality. It is a green gem and features strong dispersion and hose-tail inclusions.
      [Moh's hardness: 7] [Mineral species: Andradite garnet]

    • Diamond

      Most cut and polished diamonds are colorless or yellowish color. Various light patterns are emitted from a diamond and
      can change by the way it is cut.
      [Moh's hardness: 10] [Mineral species: Diamond]

    • Diamond Cutting

      The process of diamond cutting is generally marking, cleaving, sawing, bruting, and faceting.

    • Diamond Point Finish

      A diamond point finish is a texture that can be easily made by setting a handy micro motor to the diamond point. The surface is rougher than that of a coarse surface.

    • Dinner Ring

      Please refer to "entourage ring."

    • Dioptase

      This stone, sometimes confused with emerald in the past, was found as a new stone in 1797 by a French gemologist René Just Haüy.
      When we hold dioptase to the light, we can see a cleavage, so it has been named from ”dia” (hold up to the light) and ”opazein” (see-through) in Greek. Because it is opaque and easily cracked, the number of large stones are limited. It is unsuitable for jewelry.
      [Moh's hardness: 5] [Mineral species: Dioptase]

    • Dispersion

      When white light enters a gem, the light is dispersed into 7 colors like a prism. The weakness of dispersion light differs depending on the angle of the cut and gemstone species.

    • Dog Necklace

      A dog necklace is worn around the neck like a dog's collar.

    • Domed Band

      A domed band is one of the most basic rings. It can be hand-made or pressed. The shape of the cross section is a half-circle.

    • Double Reflection

      Double reflection is a phenomenon in which the ray entering a gemstone divides into two refracted lights.

    • Doublet Opal

      High-quality opal with play of color is very rare and valuable. Therefore, an assemblage like doublet and triplet has been made. An assemblage of thin white opal and common opal or mother rock is one of the examples of doublet opal.

    • Drop Earrings

      Drop earrings, also called pendant earrings, are a hanging type of earring. There are three types of drop earrings, the "tassel type," which its linear or round ball parts are lined up like a tuft, the mobile type, which features a swaying design of thin precious metals, and the "chandelier type," which features a swinging sparkling resembling a chandelier.

    • Dumortierite

      Dumortierite is named after M. E Dumalchie, a French paleontologist who discovered the mineral in 1881. It is often contained in quartz and silica as an assembly of fibrous and micro-hard crystals and is polished into cabochon. A high transparent crystal is occasionally produced and polished to the brilliant cut.
      [Moh's hardness: 7] [Mineral species: Dumortierite]

    • Dyeing (Treatment)

      Dyeing is the process of adding colors on colorless or white gemstones.

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