Judith Jack jewelry is named for Judith and Jack Rosenberg, the founders of the company. Originally they were dealers in estate and antique jewelry and when the demand for older vintage style pieces created from marcasite outgrew their supply, they began creating replicas and eventually designing their own jewelry line. Their jewelry is made of sterling silver and marcasite, and is available in pins, bangle and charm bracelets, necklaces, and earrings.

In addition to marcasite, many of the Judith Jack jewelry pieces include matched hand knotted Japanese pearls, and semi precious stonesTheir signature feature is the use of marcasite in their jewelry. They use the best grade "A" marcasite, which is a iron pyrate, a natural mineral mined in South America. Marcasite stones are silver colored with a bright metallic luster, often referred to "Fool's Gold" that sparkle when cut into facets. For over 30 years the Judith Jack company has been creating beautiful jewelry for contemporary women.