This is a rubber stamp 'Limonium bellidifolium' by always smile... , a Japanese stamp artist who produces stamps of plants, antique goods, and interior decorations.
The stamps are very delicate, and the idea of how to stamp them is very impressive.
You can use these stamps in combination with various other stamps to create gorgeous designs for plain envelopes, wrapping paper, and message cards.

Imprint Size: 39.9mm x 17.5mm