Ores With Borders makes ores have borders. Ores With Borders is just a simple resource pack that only does what the name suggests. It includes all of the ores that exist in the game, including nether ores. If you want a preview of what the ores look like, then here they are:

Ores:

!preview

How to install

• Hold [Win + r] and then put in: %appdata%.minecraft\resourcepacks
• Drag Ores With Borders into the folder
• Close your file explorer
• Launch MC (1.19-26.1)
• Click options, then resource packs
• Then enable Ores With Borders

Note: It might say incompatible (Made for an older version), but it still works the same as it would on 1.21 or 1.20

!Screenshot