jewel: [13] Originally, jewel meant ‘costly adornment made from precious stones or metals’ – a sense now largely restricted to the collective form jewellery [14]. The main modern sense ‘gem’ emerged towards the end of the 16th century. The word comes from Anglo-Norman juel, but exactly where that came from is not known for certain. It is generally assumed to be a derivative of jeu ‘game’, which came from Latin jocus (source of English jocular, joke, etc). => jeopardy, jocular, joke[jewel etymology, jewel origin, 英语词源]