Some of her most elaborate pieces are tiaras.

As Yager researched the plants she saw in her neighborhood, she was surprised to find that most of them were not native to the United States.
This led her to create
American Tiara: Invasive Species (2001), a tangle of urban weeds built from sterling silver and gold.
The tiara consists of individual pieces of jewelry that can be worn together or separately.
It was part of her solo show at the Victoria and Albert Museum in 2001.

The following year, it was included in the major "Tiaras" exhibition at the V&A, among 200 pieces ranging from the 18th century to the present, from punk rock to royalty.
 It is now part of the Philadelphia Museum of Art's permanent collection.

Yager's Tiara of Useful Knowledge (2006) echoes the purpose of the American Philosophical Society, defined in its charter of 1743 as "Promoting Useful Knowledge".
The tiara consists of ten plants, an ant, and a pebble, each of them wearable as separate pieces, as well as together.
The plants include ragweed, a potato leaf, clover, crab grass, lamb's quarters and a tobacco blossom.
Each plant has its own story of historical and economic significance.
The pieces celebrate new world biodiversity at the same time that they raise issues of monoculture, colonial trade and intercultural domination.

Of her interest in history, Yager says "the farther you look back, the farther you can see forward".
By invoking historic, artistic and political networks of reference, Yager creates objects of both beauty and an unusual depth of meaning.
Her pieces go beyond the "trouvaille", or found object.
 She herself has described them as "mnemonic devices", reminiscent of Pierre Nora's concept of a "lieu de mémoire" or site of memory.
Some of her most elaborate pieces are tiaras.
As Yager researched the plants she saw in her neighborhood, she was surprised to find that most of them were not native to the United States. This led her to create
American Tiara: Invasive Species (2001), a tangle of urban weeds built from sterling silver and gold. The tiara consists of individual pieces of jewelry that can be worn together or separately. It was part of her solo show at the Victoria and Albert Museum in 2001. 
The following year, it was included in the major "Tiaras" exhibition at the V&A, among 200 pieces ranging from the 18th century to the present, from punk rock to royalty.  It is now part of the Philadelphia Museum of Art's permanent collection.
Yager's Tiara of Useful Knowledge (2006) echoes the purpose of the American Philosophical Society, defined in its charter of 1743 as "Promoting Useful Knowledge". The tiara consists of ten plants, an ant, and a pebble, each of them wearable as separate pieces, as well as together. The plants include ragweed, a potato leaf, clover, crab grass, lamb's quarters and a tobacco blossom. Each plant has its own story of historical and economic significance. The pieces celebrate new world biodiversity at the same time that they raise issues of monoculture, colonial trade and intercultural domination.
Of her interest in history, Yager says "the farther you look back, the farther you can see forward". By invoking historic, artistic and political networks of reference, Yager creates objects of both beauty and an unusual depth of meaning. Her pieces go beyond the "trouvaille", or found object.  She herself has described them as "mnemonic devices", reminiscent of Pierre Nora's concept of a "lieu de mémoire" or site of memory.
Jan Yager