زفير متغيّر اللون · 1.24 قيراط

A colour-change sapphire answers the light it stands in. The crystal lets through two separate stretches of the spectrum at once, and daylight and a warm bulb each favour a different one, so the balance tips from one hue to another when the source changes. Nothing inside the stone moves; the room does. See it by a window, then under an evening lamp, before deciding where it will be worn.