A Cartier diamond and emerald brooch found in a box of costume jewellery has turned out to be genuine.
Zaalberg Pottery is a Dutch manufacturing firm that produced collectible vintage stoneware during the middle of the 20th century.
According to the 1930 Smoot-Hawley Tariff Act’s definition, “vintage” refers to pieces manufactured within the last 100 years and can include items made as recently as the 1980s.
The company was based in the Leiderdorp area of the Netherlands. It was established by the grandson of Herman Zaalberg, a famed potter from the area who was active between the two world wars.
The firm’s stoneware from the 1950s, such as dishes, bowls and vases, are particularly popular with collectors.
Pieces can often be identified by the "Zaalberg Holland" markings on the bases.
How much is Zaalberg stoneware worth?
Individual items can sell for around $40 a time at auction.
Zaalberg pieces are often gathered together at auction: a group of five glazed Zaalberg Pottery objects sold for $201 at a Christie’s auction in Amsterdam in May 1998.
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