rock ring box 3d model

A ring box shaped like a naturally cracked dark volcanic rock or hearthstone, smooth-worn river stone silhouette, roughly egg-shaped with a flat base. The surface has deep, realistic cracks and faceted angular chipped areas like fractured basalt, dark charcoal grey and blue-black coloring with subtle blue-grey mineral grain texture throughout. The rock opens as a clamshell jewelry box — the top half hinges open at the back revealing a black velvet interior with two separate ring slots side by side. The interior is clean matte black foam/velvet lined. On the front face of the closed version, there is a recessed circular cavity, approximately 4cm in diameter and 3mm deep, carved into the stone surface, perfectly flush-edged, designed to receive a separately glued circular emblem insert. 3D printable model, manifold geometry, no internal voids, wall thickness minimum 2mm, FDM-compatible, designed for Bambu Lab P1S printer, build volume 256x256x256mm. Export as STL. Scale: ap