Crystals and stones are obviously extremely beautiful and unique,
“They fashioned the breastplate...Then they mounted four rows of precious stones on it. The first row was ruby, chrysolite and beryl; the second row was turquoise, sapphire and emerald; the third row was jacinth, agate and amethyst; the fourth row was topaz, onyx and jasper. They were mounted in gold filigree settings. There were twelve stones, one for each of the names of the sons of Israel, each engraved like a seal with the name of one of the twelve tribes.” (Exodus 39:8-14).
"I vow that in a future life when I attain enlightenment, my body will be as bright and clear as lapis lazuli, flawlessly pure, vastly radiant, majestic with merit and virtue, abiding at ease, adorned with blazing nets brighter than the sun and the moon. Beings dwelling in darkness will be illuminated and will succeed in all their endeavors." (Medicine Sutra)