Mimics how real gem crystals nucleate and grow: atoms deposit onto a seed and propagate outward following the crystal's underlying lattice symmetry, forming faceted geometric clusters rather than random blobs. This simulation runs a BFS-style growth algorithm over a 4-basis-vector lattice, spawning a new physically-based glass/gem mesh (transmission + clearcoat) at each open lattice site roughly every simulation tick, then automatically resets and regrows once it fills out or gets boxed in.