Saucer with stylised flowers and precious objects

Porcelain plate with lobed rim, painted in underglaze blue. On the flat a rosette with in the center a flower in a circle in reserve, from the flower four lines with at the end a flower in reserve, on the circle branches in reserve; on the rim stylized flower vines alternating with three lines; the back with four precious objects (pearl, diamond, musical stone, scroll). Marked on the underside with the four-character mark of Emperor Yongzheng (?) in a double circle. A crack in the rim. Blue and white.