Jewelry Glossary

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    • Jadeite

      The origin of the word "jadeite" is "piedra de jada" in Spanish and it means "a healing stone against back-pain."
      Jadeite occurs as opaque lumps in metamorphic rock or found in gravel or cobble stone in some placer deposit along coast lines.

    • Jasper

      Jasper is an opaque dark brownish chalcedony, it has been used for jewelry and as an ornament since the Paleolithic Era.
      It is usually cut into cabochon and used for cameo.
      [Moh's hardness: 6] [Mineral species: Chalcedony]

    • Jet

      Jet is a fossil made by the trees that flowed and sank into the sea and stayed for a long-year in the seabed layer. It contains many carbon and has a layered tissue but not crystals. In addition to being used as a decorative product from prehistoric, it seems that ancient people believed this stone can protect
      themselves from evil because the stone raises black smoke when burning. It was also used as a jewelry for condolences as it has the heavy black tone.

      [Moh's hardness: 2.5-3] [Mineral species: Jet]

    • Jewelry Day

      In Japan, carat has been used as a unit of weight measurement since November 11, 1909.
      Since 1986, November 11 has been recognized as "jewelry day" in memory of the date "carat" was adopted.

    • JIS

      JIS is an abbreviation for Japanese Industrial Standards. It is a national standard of Japan that defines standards and measurement methods for Japanese industrial products.
      For ring size, the JIS standard is established based on ISO standards.

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