April Fools' Cobble

When the pack is active, random cobblestone blocks appear to be blocks of diamond.
['Random' works like lillypad orientation with a specific x,y,z block always showing the same.]

There are three versions that differ solely in the chance of a cobblestone block being affected:
April Fools' Cobble (1 in 13) has 1 in 13 blocks affected [​this is the version to which the link links ]
April Fools' Cobble (1 in 169) has 1 in 169 blocks affected [​availble via link at the linked link ]
April Fools' Cobble (1 in 1014) has 1 in 1014 blocks affected [​availble via link at the linked link ]

As usual, for versions 1.14 through 1-20.1, activating the pack will produce a warning that it was made for an earlier version…
this can be safely ignored.