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The composition of Nobel Prize medals, specifically the use of 18-carat green gold and 24-carat gold plating since 1980.
The Nobel Prize medals awarded today are cast in 18‑carat "green gold" (an alloy of gold and silver) and since 1980 have been plated with 24‑carat gold; earlier medals were made of higher‑carat solid ...
The Nobel Foundation’s modern medals are struck in 18‑carat recycled gold—a change implemented in 1980 and confirmed by the foundation’s own materials—reflecting a move toward using recycled rather th...
The Nobel medals were originally struck in high-purity gold (about 23-carat) from the first awards until 1980; since then they have been produced as 18‑carat “green” or electrum gold and finished with...