Opal is a unique and mesmerizing gemstone that is known for its iridescent play of colors. It is formed from a combination of silica and water, and is typically found in cracks and fissures of rocks. The colors of opal can vary widely, and can include shades of white, yellow, blue, green, red, and purple. Opals are often cut into cabochons, which are domed and polished on the top, to highlight their colorful patterns. Opals have been prized for their beauty and rarity for centuries, and are considered one of the most precious gemstones in the world. In addition to being used in jewelry, opals are also used in carvings, sculptures, and decorative objects.

英語での「opal」の定義と意味

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