The Princess Clotilda took, as if in a dream, the ring of transparent jacinth set in solid gold, and asked quietly: "What would the king of the Franks with me?"
"Historic Girls"
E. S. Brooks
The little pools of water along the low shores glowed like mirrors of polished jacinth.
"Lucy Maud Montgomery Short Stories, 1896 to 1901"
Lucy Maud Montgomery
The oriental jacinth, or hyacinth, is a brown-red corundum, which is more stable than the ordinary hyacinth, this latter being a form of zircon; it changes colour on exposure to light, which colour is not restored by subsequent retention in darkness.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin