Precious Stones: Pearl

Coral and quartz are unworthy of mention; the price of wisdom is beyond rubies.

Again, the kingdom of heaven is like a merchant in search of fine pearls.

When he found one very precious pearl, he went away and sold all he had and bought it.

And the twelve gates were twelve pearls, with each gate consisting of a single pearl. The main street of the city was pure gold, as clear as glass.