The collection was part of the Sotheby's Fine Jewels sale, which took place on 10 October. The proceeds went to charities.
The auction returned €2.2 million ($AUD3.58 million). A diamond brooch from the early 1900s sold for €162,000 ($AUD263,500), almost five times its estimate.
A Van Cleef and Arpels emerald and diamond necklace sold for €174,000 ($AUD283,100), more than double its estimate.
"I fell in love with jewellery when I first discovered natural pearls as an up-and-coming singer, and I bought myself my first string of pearls - the first piece of jewellery I'd ever bought,” Bassey said.
"However, I quickly graduated to my lifelong passion for diamonds which preceded the recording of Diamonds Are Forever. In fact, I accepted to sing the song because it rang true to me and the way I felt about diamonds then and now.”
She added: "Collecting jewellery for me is like collecting memories and this collection is full of them.”
A vintage 1960s Van Cleef and Arpels ring with brilliant-cut diamonds, gifted to Bassey by Elton John, sold for €48,000 ($AUD78,100).
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