Glass Art covers a very wide spectrum, from one-off sculptures and knitted glass, to haute couture fashion. Glass art for the most part cannot be reproduced and is considerably different than art glass or studio glass.
Mosaic Art is often decorative and can be reproduced, but in the truest artistic sense it can also be created by artists on walls and floors in a very complex fine art fashion that resembles paintings.
Ceramic Art could be fashioned of clay, terra cotta, earthenware, stoneware, porcelain or even bone china. Depending on the originality of the piece ceramic works could be considered fine art pieces, but more commonly they are decorative.