Enable the pack
1. Make sure the pack file is in your resourcepacks folder. From the main menu, choose Options > Resource Packs > Open Pack Folder to find it.
2. Back on the Resource Packs screen, find Cutesy 
Diamond Tools in the Available list on the left.
3. Click the arrow on its icon to move it into the Selected list on the right.
4. Click Done. The game reloads its textures, which can take a moment.
Check that it worked
Load a world and look at any diamond equipment. Creative mode is the quickest way to check, because you can pull every diamond item from the inventory at once:
- Tools and weapons: Diamond pickaxes, axes, shovels and swords should be pink instead of blue, both in your hand and as inventory icons.
- Armor: Put on a
diamond helmet, chestplate, leggings and boots. Press F5 to switch to third person and check that the whole set is bright pink on your character. - Horse armor: The
diamond horse armor icon should also use the pink design. - Nautilus armor: Its item icon should match the pink theme too.
The pack keeps every item's normal shape, so a pink pickaxe still looks like a pickaxe. Only the color changes. If everything is still blue, see the troubleshooting guide on pack order and conflicts.