Greek 14ct Obsidian stone intaglio portrait ring, deeply carved with head of god possibly mercury
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- Obsidian - Obsidian is an igneous rock, of volcanic origins, created when molten rock cools rapidly forming into a glass-like material. It has been used for thousands of years to make cutting tools.
- Intaglio - A term used to define a method of decoration most common in glassmaking and jewellery which involves engraving, carving or moulding an image into the background, leaving an impression, and leaving the top surface of the item flat, the opposite to relief carving, and also know as counter-relief.
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