* Aquamarine: A light blue to blue-green variety of beryl.
* Blue Topaz: Topaz is naturally colorless, but is commonly treated to create a vibrant blue color.
* Blue Zircon: A naturally occurring blue gemstone with high brilliance and fire.
* Lapis Lazuli: An opaque, deep blue gemstone known for its golden pyrite flecks.
* Turquoise: An opaque, blue-green to sky blue gemstone with matrix patterns.
* Apatite: Can be found in a range of blue hues, from neon blue to deep indigo.
* Dumortierite: A less common gemstone that can exhibit a beautiful deep blue color.
* Kyanite: A blue gemstone that can display varying shades of blue, often with a fibrous appearance.
* Benitoite: A rare barium titanium silicate mineral, usually blue in color.
* Azurite: Deep-blue copper mineral produced by weathering of copper ore deposits.
This is not an exhaustive list, but it provides a good overview of the many blue gemstone options available.