\definemathmatrix[TheMatrixA][left={\left\lvert\,},right={\,\right\rvert}]
\definemathmatrix[TheMatrixB][left={\left\lvert\,},right={\,\right\rvert},strut=1.25]
\definemathmatrix[TheMatrixC][left={\left\lvert\,},right={\,\right\rvert},strut=1.50]

\starttext

    $\startTheMatrixA[n=3]
        \NC yz \NC \frac{1}{x} \NC x \NR
        \NC zx \NC \frac{1}{y} \NC y \NR
        \NC xy \NC \frac{1}{z} \NC z \NR
    \stopTheMatrixA$

    $\startTheMatrixB[n=3]
        \NC yz \NC \frac{1}{x} \NC x \NR
        \NC zx \NC \frac{1}{y} \NC y \NR
        \NC xy \NC \frac{1}{z} \NC z \NR
    \stopTheMatrixB$

    $\startTheMatrixC[n=3]
        \NC yz \NC \frac{1}{x} \NC x \NR
        \NC zx \NC \frac{1}{y} \NC y \NR
        \NC xy \NC \frac{1}{z} \NC z \NR
    \stopTheMatrixC$

\stoptext
