Alright guys! Here's my idea. Now this can already be done with VanishNoPacket or any other plugin that makes you invisible but would be better this way: -The plugin has the invisible Admin auto-following the Suspected Xrayer -This let's the admin turn on xray and see what ores the suspected xrayer is heading to. -If following can't be done you can follow the player manually.
- install XRAY for your client - get this plugin that notifies you when someone mines diamond - get VanishNoPacket When someone mines diamond, you will know. Then you vanish and teleport to them. You use XRAY to see if they are heading to diamonds.
There's already several anti xray plugins. Here's one that I've heard good things about (but I don't use it). http://dev.bukkit.org/server-mods/ore-client-obfuscation/
Stick with Orebfuscator, its the best one out atm. The lag is worth it if you really want to deny x-ray.