Unfortunately not of jade - perhaps white marble or hardstone, worked in three concentric registers with a studded band at the centre, a pierced band with chilong and an outer relief band of scrolling. Mid 20th century
This is a version of something usually made of jade & also usually a great deal smaller. The type is ancient, but not this one I think! In spite of that and accepting the item, as is, it is a very very attractive decorative piece and made by a craftsman.
Size : diameter : 29 cm. ( 11 27/64 " ), depth 0.6 cm. ( 0 15/64" ).
Condition : good - note, one tiny hairline crack ,to the human eye - of no concern really - please study the applicable photo.