CIRCE

"(Bloom holds up his right hand on which sparkles the Koh-i-Noor diamond. His palfrey neighs." ([15.1499])

The Koh-I-Noor is one of the largest diamonds in the world, weighing 105.6 carats. It originated in India and was "given" to Queen Victoria after the British annexation of the Punjab in 1849. At the time, it set in a bracelet that Bloom may be wearing.