Ruby Crystal Tumbled

Among the books, decks, and stones on 14th Street is this tumbled stone: Ruby Crystal Tumbled (shop SKU HSRB4).

Ruby is the red variety of corundum, a very hard gem mineral. In crystal traditions, ruby is associated with vitality and devotion. Those ideas belong to folklore and personal practice, not to any medical claim.

Tumbled stones are polished in a drum, which softens sharp edges and brings out color. Natural stones vary in color, clarity, and shape, so the piece you receive will have its own character even when the weight, grade, or size is listed.

• SKU: HSRB4

You can see this one in person at Namaste Bookshop, 2 West 14th Street near Union Square in New York City, or order it online.