Mid-Century 3.11ct Unheated Ceylon Sapphire & Diamond Engagement RingA wonderful vintage unheated Natural Ceylon Sapphire Engagement Ring from circa 1950. This rare unheated Ceylon sapphire is a 3. 11ct rectangular cushion cut. The colour and saturation of the sapphire are exceptional. Take a look at our video for a true refection of its magnificent blues. It has been independently graded by the Gem & Pearl Laboratory as unheated with an origin of Sri Lanka (Ceylon). The shape, an elongated hand cut cushion is unusual