Tesserae

Colorful tesserae glass tiles arranged in a Victorian era antique micro mosaic brooch
Colorful tesserae used in a floral micro mosaic
Tesserae are tiny glass tiles that are meticulously-arranged to create artistic imagery.

Tesserae are used in mosaic and micro mosaic jewelry.
 All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)