Jewellery: Marlborough gems strike gold again with £48,000 Nathaniel Marchant intaglio at Christie's
The collection of about 800 engraved gems formed by the nobleman and politician George Spencer, 4th Duke of Marlborough (1739-1817), was the largest and most important of the age.
It resided at Blenheim Palace until it was sold by the 6th Duke en bloc at Christie, Manson & …