Trinkets

Gravedigger Items are Items that can be found by digging up Graves with a Shovel, which causes Sanity loss of 10, or gnawing them open with Woodie in Werebeaver mode, which doesn't cost Sanity.

Most of the items retrieved are "Trinkets", which can be traded to the Pig King for 2-8 Gold Nuggets, but you can also get Gears, a Blue Gem, a Red Gem, a Life Giving Amulet or Nightmare Fuel. 10% of the time, digging up a grave will spawn a Ghost instead of giving an item.

Trivia

 * The need for Gears to craft the Ice Box means it is often ranked amongst the most important items in the early game.
 * Gord's Knot is a reference to the story in which Alexander the Great was told that whoever could complete the impossible challenge of disentangling Gordian's Knot  and release the tethered cart would rule all of Asia. He released the cart by cutting the Knot with a knife, and went on to conquer much of Asia Minor, before his army rebelled. It has since become a metaphor for solving a complex problem with a simple solution, by thinking outside of the box.
 * The belief stated by Wilson and Wickerbottom that the Gnome is a religious artifact is true. A Gnome's original purpose was to protect the garden from evil sprits, which is probably why it goes with the Evil Flowers and the Box Thing in the setpiece. Because of this, Gnomes, can technically be classified as a religious artifact of some religions.
 * Contrary to popular rumour, placing a Gnome by a Pond will not result in it pulling out a Fishing Rod and casting it out.
 * WX-78 claims the Lying Robot's name is 'HAL', and is his friend. The name 'HAL' is a reference to a murderous supercomputer named HAL 9000 in the movie 2001: A Space Odyssey. The 'Lying' part of the robot's name is almost certainly because HAL 9000 was required to keep a secret, yet also be truthful at all times, causing a paradox which caused the computer to go mad.
 * The Tiny Rocketship is a reference to the comic book Destination Moon (Tintin).
 * Under the old research method, Gravedigger items were one of the best ways of gaining research points.