Setting and method for setting a decorative assembly

A setting (1), comprising:

• an upper body (15), extending around an axis (A) defining driving direction for inserting said setting (1) into a bed (8) of a piece of jewellery or timepiece (9), and including a first surface (2) arranged to receive a component to be set (10), at least one setting element (4) extending above the first surface and arranged to ensure the holding of said component to be set (10), and, aligned with said upper body (15);
• a lower body (16) including a second front surface (6) arranged to abut said bed,
• wherein said setting (1) includes, connecting said upper body (15) and said lower body (16), at least one deformable area (7) that is plastically deformable under an axial force imparted to said setting (1) in said driving direction from the upper body towards the lower body,
• wherein initially said setting (1) and said bed (8) are aligned in said driving direction, and said axial force is exerted on said setting (1) lower than a predetermined driving force that is based on a type of said bed and a type of said setting in association with the type of said bed, to move said setting up to an axial position of abutment between said second front surface in said bed,
• wherein, thereafter, a further axial force is exerted on said setting (1) or on the component to be set (10) that is positioned on the first surface (2) of said setting (1), greater than said predetermined driving force wherein said at least one deformable area (7) is irreversibly deformed and/or fractured, due to abutment of said second front surface in said bed, in the form of a clot radially pushing back a peripheral surface (3) of said setting (1) towards a lateral wall of said bed (8) during the application of said further axial force, or/and in the form of a fault radially pushing back said upper body (15) towards one said lateral wall during the application of said force.