"As well as being careful to find a system that works unfailingly, be it fingerprints or eye scans, the main factor holding back airlines from introducing more biometric systems is the lack of integration, " a spokesperson for British Airways told CNN.

CNN: Heathrow tests biometrics

One factor holding the metal back, he said, are some of the recent losses in other markets, such as equities and other commodities.

FORBES: Gold Strong In Euro Terms But Faces Offsetting Factors Against Dollar