The Libbey Glass Company has a rich history that spans over a century, and its contributions to the glass industry are significant. With a focus on innovation, quality, and elegant designs, the company has produced some of the most beautiful and sought-after pieces of glassware. Here are some of their rarest and most valuable pieces:

1. Monroe vase: The Monroe vase was designed in 1915 by Archibald Knox, a renowned designer for Liberty & Co. The vase is made of pale blue glass with carved and polished silver mounts. The vase is valued at around $20,000 and is highly sought-after by collectors.

2. Dandelion vases: The Dandelion vases were produced in the 1920s and were inspired by the Art Deco movement. They are characterized by their striking geometric shapes and frosted glass bases. The vases are rare, and a complete set of six can sell for over $10,000.

3. Three Graces vase: The Three Graces vase was designed in 1930 by Frederick Carder, a master glassblower who worked for Libbey Glass Company. The vase is made of opalescent glass and features three female figures in relief. Only a handful of these vases are known to exist, and they are highly prized by collectors.

4. Fish vase: The fish vase was created in the 1930s as part of the American Modernism movement. The vase is shaped like a fish and is characterized by its subtle shades of blue and green. Only a few of these vases were produced, and they are now worth around $6,000.

5. Gold Leaf vase: The Gold Leaf vase was designed by Reuben Haley in the 1930s and is considered one of the most beautiful designs of the Art Deco era. The vase is made of clear glass with gold leaf accents and is valued at around $3,500.

6. Wildflower vase: The Wildflower vase was designed by Rockwell Kent in 1937 and is characterized by its etched wildflower designs. The vase is rare and highly sought-after, with some pieces selling for over $4,000.

Overall, the Libbey Glass Company has produced an impressive array of glassware over the years, and their rarest and most valuable pieces are highly sought-after by collectors. With their innovative designs and emphasis on quality, the company has made a lasting impact on the glass industry, and their legacy continues to live on today.