Three Chinese monochrome teacups

Three Chinese monochrome teacups, comprising: one of tapering form with a flared rim, under a turquoise glaze, six-character Kangxi mark to base, 7cm diameter, one ovoid form, under a ruby glaze, six-character Yongzheng mark to base, 6.4cm diameter, and another, of conical form, painted with sprigs of flowers in gilt against a coffee glaze, six-character Kangxi mark to base, 6.9cm diameter (3)