Guardian Druid Tank Gems, Enchants, and Consumables — Shadowlands 9.0.5

You should use Versatile Jewel Cluster in all your sockets.

Use Spectral Flask of Power for your flask.

Potion of Spectral Agility will generally be the highest DPS potion. For pure single-target DPS, you may opt to use Potion of Phantom Fire. If you are fighting many monsters at the same time you may opt to use Potion of Empowered Exorcisms.

In Mythic+, you can use Potion of Spectral Agility as your potion for the defensive benefit from the agility gained, which will largely increase your armor from Ironfur.

In Shadowlands, you will use Spiritual Healing Potion as your healing potion. Healing potions no longer share a cooldown with Healthstones, so you can use both if you have access to a Warlock.

You should eat Steak a la Mode for the buff to your Versatility. If you want to increase your damage slightly, you can eat Smothered Shank.

Shadowlands also adds consumable Weapon oils, Weightstones, and Armor kits that stack with your enchants and each provide a small bonus

Shadowcore Oil is an extra weapon enchant that can be applied to your weapon and lasts for 1 hour; this will proc additional Shadow damage on some of your attacks, providing some extra threat.

Embalmer's Oil is also a decent option, slightly increasing your healing overall and can be good if you aren't looking for extra damage.

Heavy Desolate Armor Kit is an extra chest enchant that lasts for 2 hours and increases your stamina by 32.