Unique amethyst pieces to be auctioned by Dix Noonan Webb
A selection of fine antique jewellery and luxury wristwatches will also be offered by the auction house in its upcoming spring auction

An amethyst rivière necklace that was formerly owned by Marie-Louise, Countess Manvers will be offered by Dix Noonan Webb in its upcoming online auction of jewellery, watches, antiquities and objects of vertu on 16 March.