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D:12cm H:3cm
19th century, Japan
It is cut from the outside. There are some bite marks on the edges. In Japan, it is called giyaman. The word "giyaman" was used in the Edo period (1603-1867) to describe diamonds (kumgo-seki). It is said to be an accent of the Dutch word diamant or the Portuguese word diamao. Originally, it referred to diamonds themselves, but it became a general term for a wide range of glassware, including jewelry such as quartz and cut glass made from diamonds, and was confused with beadlo, a glassware such as sake cups, bottles, and bowls whose manufacturing process was introduced by the Dutch as early as the late Muromachi period (1333-1573). The term "giyaman" was used to refer to all glassware, except for plate glassware, which was made by the Dutch.
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