Verses with the word jewel in the Old Testament (3 verses):

Proverbs 11:22
As a jewel of gold in a swine's snout, so is a fair woman which is without discretion.

Proverbs 20:15
There is gold, and a multitude of rubies: but the lips of knowledge are a precious jewel.

Ezekiel 16:12
And I put a jewel on thy forehead, and earrings in thine ears, and a beautiful crown upon thine head.