Lady Lupin's shield is predominantly blue with an argent raguly line running from bottom left to top right. In the top left of the shield is a closed book and in the bottom right two fleurs-de-lis. Both adornments are green.
The blue and argent represent values close to Lady Lupin: peace, truth, loyalty. The raguly represents difficulties encountered. As much as Lady Lupin believes in looking forward, represented by the green, she is cognisant of the past.
The closed book symbolises Lady Lupin's passion for learning, while also demonstrating lessons learnt from past experiences. The fleurs-de-lys, though not necessarily conventional in this case, among other things, represent her aspirations to uphold the values of certain musketeers.