London

This early medieval gold ring dates to the time of the Crusades – its decoration of a five-fold ‘Jerusalem’ cross suggesting a link with the Knights Templar.

Our weekly selection from salerooms.

Valerie Arieta Decorative Arts stages a Christmas show at its Westbourne Grove pop-up shop this year, offering Mezcala stone figures from Mexico among other art and antiques.

Jewellery owned by Marie Valerie Hapsburg, the favourite daughter of Empress Elisabeth of Austria, will be auctioned by Dorotheum in Vienna on November 27.

A hitherto unknown portrait of Nelson sold for three times the top estimate at the Charles Miller (24% buyer’s premium) auction on November 5.

Drizen Dickens lots notch up notable results despite some higher-value unsolds.

Bid to a record £20,000 at a Forum Auctions (25/20/12% buyer’s premium) on September 26 was a beautifully bound example of Piranesi’s Campus Martius Antiquae Urbis.

Thousands of items are available to buy from dealers online. Here we pick out one that caught our eye this week.

Some of the most striking 19th-20th century jewellery can often be found in design sales.

Rare medals stolen from a car and found discarded in a park 10 months later have been reunited with their owner thanks to an ATG news story.

This distinctive poster with its saw-edged image was created by the Polish designer Mieczyslaw Wasilewski for Brian De Palma’s classic 1987 crime thriller 'The Untouchables'.

Our weekly selection from salerooms.

Organisers of the long-running Cotswolds Art & Antique Dealers Association Fair have hailed changes to its date and venue as offering a “wonderful” setting and the chance to expand the event’s client base.

Code locked in a briefcase for two decades, a finely preserved, 1997 first issue of Harry Potter and the Philosopher’s Stone was finally released this summer after being delivered by its Lancashire owners into the hands of a Derbyshire saleroom.

The Lyon & Turnbull Modern Made sale in London on November 14 includes an archive of material relating to Porthia Prints, the company established by St Ives artist Denis Mitchell and his brother in the 1950s.

A 1547 translation into Arabic of Euclid’s Elementa Geometrica sold for £17,000 as part of an October 23 sale of Islamic and Near Eastern works on paper at Bloomsbury Auctions (25/12% buyer’s premium) on October 22,

Thirty of the top textiles and tribal art dealers will be exhibiting at the 'London Antique Textiles & Tribal Art Fair' at the Hilton Olympia in Kensington High Street on Sunday, November 10.