Abstract: Folding box (1) for a piece of jewellery or timepiece, including a foldable blank (2) with a packaging band (3) having a direction (D) movable between an unfolded position in a plane (P) and a folded position, and including two flaps (31; 32) movable in relation to a base (30). It includes a foldable structure (4), movable between a folded position parallel to said plane (P) and a stable unfolded position, including a base face (40) fixed to said base (30) or forming said base, and two bearing surfaces (51; 52) each for receiving in abutment one of said flaps (31; 32) in said unfolded position of said foldable structure (4), Said foldable structure (4) is foldably movable, between the flat folded position and stable unfolded position, around a folding crease (46) which is oblique with respect to said direction (D), forming one edge of said base face (40).

Abstract: Folding box (1) for a piece of jewellery or timepiece, including a foldable blank (2) with a packaging band (3) having a direction (D) movable between an unfolded position in a plane (P) and a folded position, and including two flaps (31; 32) movable in relation to a base (30). It includes a foldable structure (4), movable between a folded position parallel to said plane (P) and a stable unfolded position, including a base face (40) fixed to said base (30) or forming said base, and two bearing surfaces (51; 52) each for receiving in abutment one of said flaps (31; 32) in said unfolded position of said foldable structure (4), Said foldable structure (4) is foldably movable, between the flat folded position and stable unfolded position, around a folding crease (46) which is oblique with respect to said direction (D), forming one edge of said base face (40).