A 14kt multitone piece holds the same intrinsic gold value as any other 14kt jewelry of equivalent weight, because karat purity determines material value and color is simply a function of which alloy metals are used.
Elemental Detail
The color saturation advantage of 18kt over 14kt in two-tone production follows directly from alloy composition. The higher gold content in 18kt deepens the yellow, brightens the white, and sharpens the perceived contrast between zones.
Style Notes
Two-tone gold's continuous presence in fine jewelry production across more than a century of design eras and stylistic shifts demonstrates its staying power and makes it a choice bound to age well.