Metal and Jewel Monsters Guide | Can You Recruit Jewel and Metal MonstersComment

There’s a high chance that a Ruby Golem will appear in the end of the Fire Traps area (Cinderback Ridge), the place which you can see a broken bridge made out of stone. But they can appear on both sides of the bottom-of-a-broken-bridge stadium.

Also, you might be able to find an Emerald King Slime where in that small enclosed space where slime types only spawn. It’s somewhere in Lake Squishmelt. Keep going straight until it curves right, then go right (opposite direction of the curve).

The Ultra Marine and the Pearly Wight are also both Bejewelled Monsters. The place cave area where Loss Leader spawns in Hinterquarters, sometimes is replaced by Ultra Marine (rerolls quite often actually). And I've seen a few Pearly Wights spawn in place of Wight Princes in Hinterlands, as well, in the canyon area where the Wight Princes and Silhouettes are.