Bolt - Trial Chamber
Flow - Trial Chamber
Ward - Ancient City
Silence - Ancient City
Vex - Woodland Mansion
Coast - Shipwreck
Sentry - Pillager Outpost
Eye - Stronghold
Spire - End City
Rib - Nether Fortress
Snout - Bastion Remnants
Tide - Ocean Monument/Elder Guardian
Wild - Jungle Temple
Dune - Desert Temple
Host - Trail Ruins/suspicious sand
Shaper - Trail Ruins/suspicious sand
Raiser - Trail Ruins/suspicious sand
Wayfinder - Trail Ruins/suspicious sand
Gold, Iron, Diamond, Redstone, Lapis, Copper, Emerald - Overworld mining
Netherite, Gold, Quartz - Nether mining
Amethyst - Clusters in an Amethyst Geode, Overworld
Resin - Pale Garden
Yes, you can duplicate armor trims! By placing the armor trim in the top-centre slot of the crafting grid, with a specific block below (shown in left image), with 7 Diamonds in the rest of the slots, you will recieve an extra armor trim, rather than spending hours searching for more!