Those are emeralds and sapphires on the cover there, surrounded in gold. From Wiki:
During the Carolingian era, King Charlemagne believed in the spiritual powers of gemstones and minerals, and their magical connection to heaven. He believed sapphires symbolized an image of heaven, heavenly virtues, and eternal life. Charlemagne passed down his interest in the spiritual qualities of gemstones to his grandson, Charles the Bald, who ordered the Codex Aureus and Lindau Gospels to be written in 870. The artisans created the covers with emeralds, sapphires, rubies, garnets, agate, and pearls. The standard of the work is extremely refined, with each of the gems in a setting that rises up from the plane of the cover and is decorated with fine detail. The "claws" holding the gems in place are minutely formed as acanthus leaves; earlier jeweled metalwork usually used plain "claw"-type settings.
The cover of the book is, of course, Christ in His Majesty. He is seated on a globe and He is holding a book with these words:
“I am the way, and the truth, and the life. No man cometh to the Father, but by me."
At the Wiki link above, there are other photos of some of the illuminated pages. The detailed artwork is beautiful. What strikes me is that the gospels were valued enough to have been treated in this way. The amount of money, gold, and gemstones it would have taken at this time to create this astonishing book is immeasurable. I wonder who was allowed to read it; probably not very many people!
It is so easy to ignore the gospels--all scripture really--to rush on with my day. It is so easy to put my busyness in front of what is really, a golden book. My Bible doesn't have the sapphires and the emeralds, and is not covered with gold, but it has a treasure much richer and deeper--and life changing--than the cover art. Jesus is our treasure. As Matthew 6:21 says, "For where your treasure is, there your heart will be also."
Let my life be rich in the treasure of Christ.