William IV mahogany mineral cabinet and contents by James Tennant, £4600 at Ewbank’s.

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Complete with a catalogue dated December 1835 detailing more than 400 numbered specimens, at Ewbank’s (25% buyer’s premium) in Surrey on March 24 it had an estimate of £800-1200 but sold at £4600 to an online bidder.

James Tennant, elected a fellow of the Geological Society in 1838, ran a mineral shop at The Strand until 1881.

As mineralogist to Queen Victoria, he is best known for supervising the cutting of the Koh-i-Noor diamond for the crown jewels.