Updated: Still the same diameter and (still) thin enough to be wrapped around an object but a new design (with a larger flat area in the center; shown in one of the photos above with a 14mm cabochon).
21mm diameter. Pretty, lacy edges (hence using as a cake plate).
Sold individually.
These are also included in the Alice in an Altoids Tin Kit – May 2016; see all the other kit components available to buy separately.
220618LCO round 150501AlcTinKit 210221KW 200308CL 210318CL