Hello Gavin,
your example would have been referred to as gold, even if it were a fairly low carat alloy. Suasa is supposed to have that copper hue but contain enough gold to avoid getting patinated when handled regularly. Basically, any yellow gold alloy (including "pure" gold) would be considered gold while red gold would be suasa (often at the low end of the carat scale).
Regards,
Kai
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