1. A light, precious gold-titanium based alloy comprising, by mass, from 750 to 780 of gold,wherein said alloy has the following composition formula:
where a b, c, d are atomic proportions such that:
0.45?a?0.55; 0.41?b?0.495; 0.025?c?0.13; 0.001?d?0.025,
wherein M represents at least one element selected from the group consisting of Nb, V, Pd, Pt, and Fe, and
T represents boron and optionally an additional element, and
wherein the additional element is selected from the group consisting of Nb, V, Pd, Pt, Fe, Mo, Ta, W, Co, Ni, Ru, Rh, Ir, Cr, Mn, Cu, Zn, Ag, Al, Si, Ge, Sn, Sb, and In,
M and T are different elements, and
the alloy comprises the boron as T or as a part of T in an atomic content of from 0.03% to 0.3%.