This page defines a group of items, Dragonstone Armor.
Dragonstone Armor is the result of combining a Diamond Helmet, Chestplate, Leggings, or Boots with a Dragonstone Scale and a Dragonstone Upgrade Smithing Template on a Smithing Table.
Dragonstone Armor has the same stats as Netherite Armor, but with their armor and armor toughness values boosted by 1 point. Also, they are unbreakable, meaning they won't take durability damage.
Unlike Netherite, Dragonstone Armor is not resistant to lava or fire.
Each piece of Dragonstone Armor worn by a player gives them a speed debuff (more for the better pieces of armor). This debuff stacks, so wearing too much Dragonstone Armor is not a good idea.
It's generally the best idea to not use more than 2 pieces of Dragonstone Armor, or to use things that buff your speed, like Sweet Berry Cookies or the Agility enchantment.