Revelation 4:2-4

Amplified Bible

²At once I was in [special communication with] the Spirit; and behold, a throne stood in heaven, with One seated on the throne.^(A) ³And He who sat there appeared like [the crystalline sparkle of] ^[a]a jasper stone and [the fiery redness of] a sardius stone, and encircling the throne there was a rainbow that looked like [the color of an] emerald.^(B) ⁴Twenty-four [other] thrones surrounded the throne; and seated on these thrones were ^[b]twenty-four elders dressed in white clothing, with crowns of gold on their heads.

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Footnotes

Revelation 4:3 In antiquity this name was given to various kinds and colors of precious stones, while the sardius was a reddish stone. The gems are indicative of royalty.
Revelation 4:4 The twenty-four elders may indicate the twelve tribes of Israel together with the twelve apostles, representing redeemed humanity. Others say the twenty-four may be an angelic order of worship akin to the Aaronic priests.