Bracelet of Rock Magic

TftYP p228
While you wear this gold bracelet, it grants you immunity to being petrified, and it allows you to cast flesh to stone (save DC 15) as an action. Once the spell has been cast three times, the bracelet can no longer cast it. Thereafter, you can cast stone shape as an action. After you have done this thirteen times, the bracelet loses its magic and turns from gold to lead.

PHB

Flesh to Stone

6-level Transmutation

Casting Time: 1 action
Range/Area: 60 feet
Components: V, S, M
Materials: a pinch of lime, water, and earth
Duration: Concentration, 1 minute
You attempt to turn one creature that you can see within range into stone. If the target's body is made of flesh, the creature must make a Constitution saving throw. On a failed save, it is restrained as its flesh begins to harden. On a successful save, the creature isn't affected.
  A creature restrained by this spell must make another Constitution saving throw at the end of each of its turns. If it successfully saves against this spell three times, the spell ends. If it fails its saves three times, it is turned to stone and subjected to the petrified condition for the duration. The successes and failures don't need to be consecutive; keep track of both until the target collects three of a kind.
  If the creature is physically broken while petrified, it suffers from similar deformities if it reverts to its original state.
  If you maintain your concentration on this spell for the entire possible duration, the creature is turned to stone until the effect is removed.

PHB

Stone Shape

4-level Transmutation

Casting Time: 1 action
Range/Area: Touch
Components: V, S, M
Materials: soft clay, which must be worked into roughly the desired shape of the stone object
Duration: Instantaneous
You touch a stone object of Medium size or smaller or a section of stone no more than 5 feet in any dimension and form it into any shape that suits your purpose. So, for example, you could shape a large rock into a weapon, idol, or coffer, or make a small passage through a wall, as long as the wall is less than 5 feet thick. You could also shape a stone door or its frame to seal the door shut. The object you create can have up to two hinges and a latch, but finer mechanical detail isn't possible.

History

The golden circlet is a bracelet of rock magic that was originally a ring belonging to a stone giant. it was found in Kanisura's Ruined Temple located in a pocket dimension that was attached to Greycott's ancient catacombs.
Item type
Magical
Rarity
Very Rare, requires attunement
Weight
1 lb.
Base Price
9,000 gp