By way of comparison, a necklace of 15mm beads that recently sold on eBay for about $340.
I think the larger swallows and sky swirls make for a more dramatic design. These swallows are a pretty much a trademark of products of the Beijing Enamel Factory (JingFa) circa the 1970s.
I bid on this necklace because I felt obliged to, but was relieved to be outbid, mainly because I have a dislike of that brick red enamel. The birds are neatly depicted in an appealing variety of color schemes, however, so I think this is a good example of better Chinese cloisonne beads.
The leaves seem somewhat similar to the water weeds accompanying beads with koi.
I wonder why I never saw these sorts of cloisonné beads in the 1970s (?). At that time I often went to the stores of Chinese merchants in San Francisco, that provided new and old beads. (That's where I first found Chinese millefiori beads on tassels—offered as "ceramics.")
I did see and buy occasional new floral cloisonné beads at that time. As well as a few old champlevé beads. I could not afford to buy much—but I saw what was offered.
JDA.