'Pearls' in the Bible

Give not that which is holy unto the dogs, neither cast your pearls before the swine, lest haply they trample them under their feet, and turn and rend you.

Again, the kingdom of heaven is like unto a man that is a merchant seeking goodly pearls:

In like manner, that women adorn themselves in modest apparel, with shamefastness and sobriety; not with braided hair, and gold or pearls or costly raiment;

And the woman was arrayed in purple and scarlet, and decked with gold and precious stone and pearls, having in her hand a golden cup full of abominations, even the unclean things of her fornication,

merchandise of gold, and silver, and precious stone, and pearls, and fine linen, and purple, and silk, and scarlet; and all thyine wood, and every vessel of ivory, and every vessel made of most precious wood, and of brass, and iron, and marble;

And the twelve gates were twelve pearls; each one of the several gates was of one pearl: and the street of the city was pure gold, as it were transparent glass.