Does what it says, perfect for diamonds economies. There's nothing else like it to my knowledge

Cool, simple plugin that does at it says it does. Unfortunately does not yet work with GeyserMC cross-play, but a good plugin for Java only servers to make trading easier. Professional and responsive developer.

Do not use this plugin if you have Bedrock-Java crossplay. It works as intended for Java players, but players on Bedrock were able to turn regular Gold Nuggets into Diamonds for a couple weeks on my server before the issue was finally reported to me. Due to this serious bug, we are no longer using this plugin.