Do all blue gems have different names, e.g. aquamarine, tanzanite, etc.?

 Not all blue gems have different names, but many blue gemstones do have distinct names based on their unique properties, origin, and color variations. Here are some examples:

1. Aquamarine: A blue to greenish-blue variety of the mineral beryl.
2. Sapphire: Typically associated with the color blue, sapphires come in various shades, including blue, and are a variety of corundum.
3. Tanzanite: A relatively rare gemstone with a distinct blue to violet-blue color, typically found in Tanzania.
4. Blue Topaz: Topaz occurs naturally in various colors but is often irradiated to produce shades of blue.
5. Lapis Lazuli: A deep blue metamorphic rock used as a gemstone. It's not technically a mineral but is valued for its intense blue color.
6. Turquoise: Known for its blue to greenish-blue color, turquoise is a phosphate mineral that has been used as a gemstone for centuries.
7. Kyanite: Typically blue in color, this gemstone also occurs in other hues, such as green and black.

While these gems showcase various shades of blue, not all blue stones have distinct names. Some might simply be referred to as "blue" followed by their mineral or gemstone name if they lack a specific and unique commercial name