The Diamond Theory Sale

Spanning over a century, we choose our favourites from Collector Square's Diamond Theory sale. Click on the 'Editor's Picks' below to buy online. 

  • Wear a vintage brooch in your hair for a fresh take on diamonds. This 1950's brooch is made of platinum and set with baguette and round cut diamonds and was part of the Collector Square 'The Diamond Theory' 2018 sale. Go to for more inspiration or visit the showroom at 36 blvd Raspail, Paris. £22,770
  • Typical of the 1950's style for larger jewels made in platinum these ear clips feature both channel-set baguette diamonds as well as round cuts to emphasis the sweeping form of the earrings. Visit our 'Editor's Pick' on home page to buy.  Price: £11,670
  • Spanning over a century, The Diamond Theory sale includes pieces such as this 1960's ring in gold with diamond pavé set in platinum. Visit our 'Editor's Pick' on home page to buy.  Price: £6,410
  • One of the dozens of jewels for sale by Collector Square, this platinum and diamond 'pont' or bridge ring from the late 1930's is a striking example of design at the end of the Art Deco era as the style became more sleek and geometric. Visit our 'Editor's Pick' on home page to buy. Price: £5,530
  • One of the earliest pieces in the sale is this Belle Epoque pear-shape pendant watch in platinum with diamonds. Rich in details the other side of the pendant reveals a fully working hand-wound watch. Visit our 'Editor's Pick' on home page to buy.  Price: £4,670
  • René Boivin emerald and aquamarine starfish brooch estimate: $70,000 -  $100,000
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