Timepiece or piece of jewellery made of a light precious alloy containing titanium

An external component comprising a light precious alloy comprising titanium and palladium, wherein the alloy has an atomic formula TiaPdbMcTd,

• wherein:
• a, b, c, d are atomic fractions of the total, such that a+b+c+d=1,
• a is between 0.44 and 0.55 inclusive,
• b is between 0.30 and 0.45 inclusive,
• c is between 0.04 and 0.24 inclusive,
• d is between 0.001 and 0.03 inclusive,
• the alloy comprises at most two metals M selected from the group consisting of Nb, V, Fe, Co, Au, and Pt, wherein the atomic fraction c is the sum of the atomic fractions of the metals M,
• the atomic fraction d is the sum of the atomic fractions of trace metals T, wherein each trace metal T has an atomic proportion of less than 3.0% of the total alloy, and the trace metals T are selected from the group consisting of Nb, V, Mo, Ta, W, Fe, Co, Ni, Ru, Rh, Ir, Au, Pt, Cr, Mn, Cu, Zn, Ag, Al, B, Si, Ge, Sn, Sb, and In, with the exception of the metals M incorporated in the alloy, and the alloy comprises at least 0.05% in atomic fraction of boron,
• and wherein the alloy comprises 50% to 60% by mass of palladium.