This is the weird part of the search. Doom 3 doesn't have "gems." Resurrection of Evil has (the Grabber, the Helltime Modifier, the Berserk sphere).

In the early days of PC gaming archives, "Stojbro" was a known name within the community for providing pre-patched or organized game files. When searching for these specific versions, ensure your antivirus is active, as legacy files from third-party sources can occasionally carry outdated vulnerabilities. Gameplay Tweaks: "Unlimited Gems" & Power-Ups