Sentence:  The pupils of his eyes were as dark as his hair, except that they were flecked with sparks of hazel: as a child, strangers were apt to say that a pair of <WSD>twinklers</WSD> like his could be sold as diamonds to a duchess (later, when it came time for him to be included in Deeti's shrine, much would be made of the brilliance of his gaze). 
Meaning of the word marked with <WSD> tags:  An eye.