A vintage piece, pin - brooch or button. This perfect piece of micro mosaic jewelry is marked on the back "Made in Italy". Vintage, the tiles are very small and called Micro - mosaic for that reason. All the tiles are there.
This might now be considered a pin or brooch but many times these came in a set of 4 to 6 alike to be placed on a blouse. You would take them off before washing so there would be no rust marks. This is how most buttons were back before plastics. I have a set of them in a rounded shape. Larger ones, perhaps like this, may have been used for a brooch. It certainly would be used for a brooch today. It is 1 inch wide.
Made in about 1900, this one. Very small tiles. They have been re-created in the past years…but the tiles are not this small anymore.