Three jade circular plaques undercut with movable roundels

Three jade circular plaques undercut with movable roundels
Late Qing/Republic period
The first of thick section, the outer ring of raised C-scrolls joined by spacers to an inner ring engraved with the Eight Trigrams and enclosing the cinquefoil roundel centered with a taiji symbol; the second engraved with double lozenges on the outside edge and raised bosses and C-scrolls on the face of a wide ring enclosing an intricately worked movable roundel of eight ruyi stems; the third with an intertwined rope border surrounding a bi-disc with engraved line patterns enclosing a cinquefoil roundel.
2 3/16 to 2in (5.6 to 5cm) diam.