"Like the stone and iron golems found in Tower towns, diamond and gold golems are highly crafted statues animated through magic. Spells have only a 15% chance of affecting gold golems and a mere 5% chance of affecting a diamond golem."

Diamond Golem (H3) icon
Diamond Golem (H3)

Diamond Golems are a neutral unit not associated with any factions of Antagarich, appearing in the video game Heroes of Might and Magic III and its expansion packs, Heroes of Might and Magic III: Armageddon's Blade and Heroes of Might and Magic III: The Shadow of Death. They can only be recruited from a Golem Factory on the adventure map, just like the Gold Golems.

Diamond Golems are a sturdy ground unit, and are the strongest golem type in the game. While slow, they are extremely resistant to magic, with damage from spells being reduced by a whopping 95%. With this, spells are very unlikely to be effective, and thus attacking with ranged units is a player's best option.

See the article on Diamond golem (H3) on Fandom's mightandmagic wiki.