Draw this diamond pattern
Canvas, 26 25 24 21 18 bytes

４／╬/╬⁰ｒ：⤢ｎ↷⁸｛Ａ×├ｍ↷


Try it here!

-3 bytes by fixing ｍ not repeating canvas

Explanation:

4/╬                 quad-palindromize a 4-long diagonal - big inner diamond
   /╬               quad-palindromize "/" - small diamond
     ⁰r             join the two vertically, centered
       :⤢n          overlap with transpose
           ↷        and rotate the thing clockwise
            ⁸{      for each input
              A×      times 10
                ├     plus 2
                 m    mold the canvas to that width
                  ↷   and rotate clockwise, setting up for the next iteration