Notice the flat nuclei and the distinct pink matrix on the left side of the picture. These are fibrocyte nuclei and the matrix has a lot of collagen. The tissue on the left side is therefore fibrous - it is the perichondrium.
The nuclei are rounded and the cells are larger on the right. Also, on the right side the matrix appears homogeneous. This is the cartilage.
Mind you, there are fibres in cartilage matrix! They are not seen.

In the picture on the left, note two cells at the top which have jus begun to separate. The cells in the lower lacuna in the same picture have probably just been formed by division of a parent cell.

"Daughter" cells arising from such division produce matrix around themselves. This new matrix gradually separates the cells. The newest matrix is therefore seen in the immediate surroundings of a cell. This matrix appears bluish. It is called territorial matrix.