There's absolutely no sign that this has ever been used. Still bright and shiny as the day it was made.  There's a tiny tiny darkish spot on the inside of the lid. It would likely wash, but I didn't attempt, and instead featured it in the final picture. It's right next to the vent hole.

From the maker:

The Superstone® Bread Dome mimics a professional brick-lined oven right in your own kitchen! The Superstone Bread Dome is the perfect shape for baking no-knead breads. The domed shape circulates air for a uniform heat producing perfect baking results. Superstone® stoneware material heats evenly, producing a bread crust without hot spots. The unglazed interior lid pulls moisture from the dough, producing a bread with a crackly crust and light interior crumb just like breads from your favorite artisan bakery! Many baking cookbooks recommend Superstone because of its superior performance. Great for roasting potatoes with a fluffy light interior and crispy skin. Roast succulent chicken, meats and vegetables. The glazed bottom won’t absorb flavors, making this a truly versatile piece. And the glazed interior makes cleanup a snap! It's dishwasher, microwave and convection oven-safe.

Sassafras Superstone® Bread Dome (Tangerine Glazed) Features:

Made of Stoneware

The unglazed interior of the lid pulls moisture away from your bread dough, which creates the ideal crackly crust.

The dome lid mimics a professional brick-lined oven

The interior of the base is glazed to prevent flavor and odor absorption. It’s also nearly nonstick

Produces a round artisan loaf - perfect for no-knead breads!

Use it for baking veggies and even meats, too. (Try it when you want roasted potatoes with crispy skins and fluffy interiors!)

Crafted from stoneware fired at 2100°F, enabling it to withstand high oven temperatures (just avoid open flames)

Color: Tangerine

Dimensions:

  Overall Height: 8" (to top of handle)

  Overall Width: 12.25"

Base Outer:

  Diameter: 9.75"

  Height: 4.5"

Base Inner:

  Diameter: 9.25"

  Height: 4.5"

Lid Outer (to top of handle):

  Diameter: 8.75"

  Height: 3.25"

Lid Inner:

  Diameter: 8.25"

  Height: 3.25"

Base & Lid (to top of handle):

  Width: 12.25"

  Height: 8"

Base & Lid (to top of dome):

  Width: 12.25"

  Height: 7.5"

Dishwasher safe

Microwave safe

Oven Safe