In 2002 to celebrate the Queens Golden Jubilee, the Royal Mint released a very Limited Issue £1 One Pound Gold Proof Coin struck in solid 22 Carat Gold.

2002 Great Britain GOLD PROOF 1 Pound Coin

NGC Certified and Graded as PF 70 Ultra Cameo (Highest Graded)

Very low mintage: only 2002 coins minted (only one available on Ebay as of Oct 2021)

Composition 91.67% Gold, 8.33% Silver (22 Carat Gold)

Metal Content: 0.578 Troy Ounces
Weight: 19.619 Grams
Diameter: 22.50mm

Manufacturer: Royal Mint
Issuing Country: United Kingdom
Year: 2002
Collections: Golden Jubilee
Denomination: £1
Metal: Gold
Purity: .9167
Quality: Gold Proof

The reverse, designed by Norman Sillman, depicts Three Lions of England, passant guardant while the obverse features Ian Rank Broadley's portrait of Queen Elizabeth II. 

The edge is reeded and bears the lettering "DECUS ET TUTAMEN"