What does Margerite find in Sir Percys study? What does it imply?

Marguerite finds a solid gold ring with a star-shaped flower, an item that links Percy to the Scarlet Pimpernel.

Her head began to ache, she turned away from this strange Blue Beard's chamber, which she had entered, and which she did not understand. She did not wish Frank to find her here, and with a fast look round, she once more turned to the door. As she did so, her foot knocked against a small object, which had apparently been lying close to the desk, on the carpet, and which now went rolling, right across the room.

She stooped to pick it up. It was a solid gold ring, with a flat shield, on which was engraved a small device.

Marguerite turned it over in her fingers, and then studied the engraving on the shield. It represented a small star-shaped flower, of a shape she had seen so distinctly twice before: once at the opera, and once at Lord Grenville's ball.