The world’s most precious non-public jewelery assortment will go on show in London from Saturday earlier than what is predicted to be a record-breaking £120m charity public sale.

The greater than 700 objects of jewelery collected by the late Austrian billionaire artwork collector Heidi Horten is on a world tour, taking in New York, Singapore, Taipei and London, within the run-up to a four-part public sale at Christie’s in Geneva subsequent month and on-line. Among the prime items shall be on public show at its St James’ public sale room in central London from Saturday to Wednesday.

The gathering features a white gold and diamond Cartier ring set with the Dawn Ruby, the world’s most precious non-diamond gemstone, which Horten purchased for $30.4m (£24.5m) at public sale eight years in the past. The 25.59-carat uncommon “pigeon’s blood” Myanmar ruby ​​is described by the Swiss Gemmological Institute as a “distinctive treasure of nature” and is predicted to promote for $15m-$20m.

Additionally up for public sale are the Briolette of India, a 90.38-carat colourless diamond lower by the jeweler Harry Winston and a three-strand pure pearl necklace with an 11-carat pink diamond clasp estimated to promote for $7m to $10m.

In whole the gathering is predicted to fetch greater than $150m (£120m), making it essentially the most useful set of jewels ever offered at public sale – eclipsing the $116m Elizabeth Taylor’s offered for in 2011 and the $109m sale of the Qatar’s ruling Al Thani household’s in 2019.

Rahul Kadakia, Christie’s worldwide head of jewelery, described Horten’s treasures as “the gathering of a lifetime”.

“From Bulgari to Van Cleef & Arpels, from a small private reminiscence piece to the Briolette of India, it is a collector’s dream,” he mentioned.

Horten – who inherited an estimated £2.7bn when her husband, the division retailer magnate Helmut Horten, died in 1987 – died in June 2022 with no direct heirs.

Issues have been raised in regards to the supply of the household fortune, together with allegations that Helmut Horten acquired belongings from Jewish individuals who had had their property confiscated by the Nazis.

A Horten assortment commissioned report by historians on the College of Würzburg discovered he “benefitted from the financial circumstances offered by the Nazi state. He didn’t, nevertheless, take energetic steps to exert strain on the Jewish sellers.”

All proceeds from the Christie’s sale will go to the Heidi Horten Basis, which she units up in 2020 to fund a public artwork museum in Vienna to carry her huge artwork assortment and to fund medical analysis.

Horten died simply days after opening the museum’s Heidi Horten Assortment, which incorporates items by Francis Bacon, Gustav Klimt, Damien Hirst, Egon Schiele and Pablo Picasso.

A eager ice skater in her youth, Horten was a lifelong ice hockey fan and supported the Austrian group EC-KAC to which she reportedly donated €3m (£2.7m) a 12 months. The group has named its new stadium after her.