Let $\varphi=(1+\sqrt5)/2$. The four-point set $\{0,\varphi,\varphi^2,\varphi^3\}$ is classical: up to a dilation it consists of the two endpoints and the two crossing points on a side of the regular pentagram (Euclid, Elements XIII.8), and, by the identity $\varphi^2=\varphi+1$, its six pairwise differences are $1,\varphi,\varphi^2,\varphi^3$, with multiplicities $1,2,2,1$. We write this configuration as the golden quadruple $S=(F, F-a, F-b, F-a-b)$, where $u>0$, $a=\varphi u$, $b=\varphi^2u$ and $F>a+b$, and study its extremal and rigidity properties. We prove that it is maximal and unique: no five distinct real numbers have all their positive differences in $\{u,\varphi u,\varphi^2u,\varphi^3u\}$ (indeed, not even in the whole set $\{u\varphi^n:n\in\mathbb{Z}\}$), and every four-element set with this property is a translate of $S$. We prove that the golden ratio is forced: $\varphi$ is the only ratio $x>1$ for which some four-point set of reals has the four-term progression $\{c,cx,cx^2,cx^3\}$ as its set of distinct differences. For the analogous quadruple with base $x>1$, $x\neq\varphi$, the failure is measured by two closure residues, $(x^2-x-1)u$ and $x(x^2-x-1)u$, which along Fibonacci quotients equal $\pm u/F_n^2$ and $\pm F_{n+1}u/F_n^3$. Finally, the cosine sum $C_S(t)=\sum\cos(2πd t)$ over the six differences equals $8\cos^2(πa t)\cos^2(πb t)-2$; it is not periodic, but it is almost periodic in the sense of Bohr, with explicit almost periods $F_n/u$. For an arbitrary scale $K>0$ the golden ladder $ν_n=K\varphi^{-n}$ realises the construction with $u=ν_{203}$, so that the differences are $ν_{200},\dots,ν_{203}$; we evaluate it for $K=\sqrt{c^5/(Gh)}$. We state explicitly what is classical and what is new, in relation to difference sets, Golomb rulers, Sidon sets, Fibonacci numbers, quasicrystals and almost periodic functions.