Instead of creating a visual image of God (Exodus 20:4; Deuteronomy 4:15–19), John uses gemstones and the rainbow (Genesis 9:8–17; Ezekiel 1:28) to suggest God's qualities. The rainbow represents God's grace, reminding us of God's promise to Noah (Genesis 9:13–17) that he would never again flood the earth. However, in Revelation, the earth is destroyed by fire (Genesis 19:24–29).