This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To decorate, as iron, steel, etc., with a peculiar marking or “water” produced in the process of manufacture, or with designs produced by inlaying or incrusting with another metal, as silver or gold, or by etching, etc., to damask.

To ornament (metal, as steel), by inlaying or otherwise, in such a way as to produce an effect compared (originally) with that of damask; ornament with flowers or patterns on the surface; damask.

"In the creeks, where the water was still and clear, and where throughout the day, like a delicate damaskeen, the shadows of leaves that overhang would lie, the Speckled Trout broke the surface of the pool in his gladness of the coming day."

damasken   

damaskeening