The Mughals brought with them from Central Asia a very different set of ideas about gemstones to those then held in India. These ideas derived from the philosophy, aesthetics and literature of the Persian world. Here it was not diamonds but ‘red stones of light’ that were given pre-eminence.10 In Persian literature such stones were prized as symbols of the divine in metaphysics and of the highest reaches of the sublime in art, evoking the light of dusk – shafaq – that fills the sky immediately after the sun has set. As Ferdowsi writes in his great Shah-Nama, or Book of Kings: When the sun gave
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