ישעיהו נד:יב פירוש: רש״י, מלבי״ם ואבן עזרא

jasper Heb. כַּדְכֹד, a kind of precious stone.

Kadkhod is the gemstone called Shoham, according to the Sages.

כדכד Agates. It is hap. leg.; it is the name of a precious stone.