Spangold

Spangold is a family of shape memory-effect alloys (SME) of gold, copper, and aluminum in either 18K or 23K which, when heated and cooled correctly, results in a multi-colored faceted finish which is appealing as jewelry. The name of the family is a play on the word "spangled".[1]

Spangold is a beta-phase alloy with a nominal stoichiometry of Au₇Cu₅Al₄ and a nominal composition by mass of 76% gold, 18% copper, and 6% aluminum. The texture is caused by the induction of a martensitic-type phase transformation on a polished surface.[2][3]

References

Ira Wolff; Michael Cortie (1994). "The Development of Spangold". Gold Bulletin. 27 (2): 44–54.
"Spangold Alloys". Total Materia. July 2013.
"Spangold : a now aura for Intermetallica". Metal Abstracts. 27: 15. June 1994.

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[1] Ira Wolff; Michael Cortie (1994). "The Development of Spangold". Gold Bulletin. 27 (2): 44–54.

[2] "Spangold Alloys". Total Materia. July 2013.

[3] "Spangold : a now aura for Intermetallica". Metal Abstracts. 27: 15. June 1994.