Abstract: As a new design, when making part of a decoration rotatable, there is a tendency for this to result in an unnecessarily complex structure, and it was difficult to apply such structures to small decorations such as rings, due to considerations such as strength and smooth movement. Solution: The present invention was configured as follows in order to provide a decoration which, even if having a small size, has a simple structure and strength, and opens like a flower. The decoration has a configuration whereby one of a group of movable petals (1) having a calculated curved surface (2) and which are positioned so as overlap with the positions to be rotated and are synchronized with one another, is opened and closed by a single rotating knob (11) and is synchronized with the other petal-shaped parts (1) smoothly and effectively to replicate the movement of a flower opening and closing.

Abstract: As a new design, when making part of a decoration rotatable, there is a tendency for this to result in an unnecessarily complex structure, and it was difficult to apply such structures to small decorations such as rings, due to considerations such as strength and smooth movement. Solution: The present invention was configured as follows in order to provide a decoration which, even if having a small size, has a simple structure and strength, and opens like a flower. The decoration has a configuration whereby one of a group of movable petals (1) having a calculated curved surface (2) and which are positioned so as overlap with the positions to be rotated and are synchronized with one another, is opened and closed by a single rotating knob (11) and is synchronized with the other petal-shaped parts (1) smoothly and effectively to replicate the movement of a flower opening and closing.

Abstract: As a new design, when making part of a decoration rotatable, there is a tendency for this to result in an unnecessarily complex structure, and it was difficult to apply such structures to small decorations such as rings, due to considerations such as strength and smooth movement. Solution: The present invention was configured as follows in order to provide a decoration which, even if having a small size, has a simple structure and strength, and opens like a flower. The decoration has a configuration whereby one of a group of movable petals (1) having a calculated curved surface (2) and which are positioned so as overlap with the positions to be rotated and are synchronized with one another, is opened and closed by a single rotating knob (11) and is synchronized with the other petal-shaped parts (1) to smoothly and effectively replicate the movement of a flower opening and closing.