Pietra dura (English spelling) [Italy]

Japanese: ピエトラ･ドゥーラ（英語表記）pietra dura[イタリア]

The term refers to hard stones, such as gemstones, agate, chalcedony, jasper, and lapis lazuli, and to items made of them. The plural form, pietre dure, refers to items made by combining several different types of gemstones. In European countries other than Italy, it is mistakenly used in the singular form to refer to panels made of small pieces of various types of gemstones combined according to a certain design. Seals, ornaments, and decorative caskets have been made from these gemstones since ancient times.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

硬い石の意で，宝石やメノウ，カルセドニー，ジャスパー，ラピスラズリなどの貴石およびその細工品を指す。複数形のピエトレ･ドゥーレpietre dureは数種の宝石･貴石を組み合わせた細工品を指す。イタリア以外のヨーロッパ諸国では誤って単数形で，いろいろな種類の宝石･貴石の細片を一定の意匠に従って組み合わせたパネルのことを意味する場合もある。　印章，装身具，装飾小箱などが古くからこれらの貴石から作られた。

出典　株式会社平凡社世界大百科事典第２版について　情報

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