■刻印とホールマーク
ジュエリーで使用するに当たり、割金がどれだけしてあるか、純度がどれだけあるかというものを地金に打ってあるもので、 日本では2通りあり、1つはジュエリー製作者が製品の完成後に自分で打刻する刻印で、 もう1つは造幣局が打つ国家検定の刻印です。この造幣局の刻印は1929年(昭和4年)より始まり「ホールマーク」 「造幣局検定マーク」とも呼ばれています。
ジェムケリー
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