Main export of Israel: https://oec.world/en/profile/bilateral-product/diamonds/repo...
Local presentation of mining sites: https://en.israelidiamond.co.il/wikidiamond/diamond-mining-m...
Some historical background and interesting sources: https://en.wikipedia.org/wiki/Diamond_industry_in_Israel
As mentioned, reading up on Dan Gertler is a good idea too.
Sudan complaining recently about foreign involvement: https://sudantribune.com/article283888/
If you look into Omar al-Bashir's 'career' you'll likely find it enlightening about the degree of Gulf involvement in Sudan. The Gulf states are really, really good at PR, they can afford the biggest, most efficient firms to run it for them, but there are a lot of books about the colonial history in the region and how trade and economics have evolved over the last century.
The strategically importantly located island of Socotra has a really interesting history, lots of pirates and stuff. Since 2018 UAE is occupying it and lately Yemen news sources have claimed that Israel is in on it, and the US DoD has been asked whether they're there too. Starting point: https://en.wikipedia.org/wiki/United_Arab_Emirates_takeover_...
If you look into it you'll find that it's a nice marketplace for israeli oligarchs running operations in DR Congo, e.g. for diamonds which Israel exports unexpected amounts of, and you'll also find that the Rapid Support Forces/Janjaweed in Sudan are buddies of the UAE. Unlike Switzerland the UAE is quite aggressive militarily, e.g. occupying part of Yemen.