Understanding the Word 'Azure'

In the quiet town of Eldersville, nestled between lush hills and flowing rivers, lived a renowned botanist named Dr. Maple. Known for his deep understanding of plant species, Dr. Maple dedicated his life to studying the various flora that thrived in the region. One day, while exploring a secluded forest, he stumbled upon a new species of flower. The petals were a vibrant shade of blue, unlike any he had ever seen. Excited by his discovery, he decided to name the flower 'Azure Serenade'.

The term "azure" in this context refers to a specific color. If you were to look for a synonym of the word "azure", which of the following would best fit this description?