It is a QiJia cong, the specific art from QiJia is there are quite a lot of inlay works in their JADEwares , Please referencet o page 275 to 278 of the book named "Qijia culture Jade wares" ISBN 7-80663-126-7/K .152* }- w0 A( }1 J- W! _% n- M/ l
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The Form of cong can be more than 4 sides different by certain culture, So far there are Triangular[2-sided] Rectangular [4-sided] & Round.....4 H( M) h$ b. B2 o5 y4 h
By the way , the material is jade......NOT stone |