The Stellazzio side quest involves collecting Stellazzios from around the world and returning them to Queen Stella. She will provide you with a reward for each one that you return to her.
None of the Stellazzio coins are missable, therefore there are no warnings placed throughout the walkthrough as you can return to any of these areas if you missed any of the coins during your playthrough.
Queen Stella can be found in Treno near the Synthesis Shop as shown in the screenshots above. The locations of each of the Stellazzio coins is listed below along with a list of rewards that you will receive for turning them in.
In the Village of Dali inside the Windmill room behind the pillar on the wall.
At the entrance of Burmecia behind a wooden box in the middle of the first street.
Located in Quan’s Dwelling. It can be found near the pool after climbing down the rope.
Examine the fountain at the entrance of Treno and choose to “Throw in 10 gil”. The Stellazzio will appear after doing this 13 times.
Search the area behind the Item Shop stall in Treno (shown in the screenshot).
Located in Black Mage Village on the right side of the Inn (near the beds).
Explore the area behind the fountain at the entrance of Madain Sari.
Located in Alexandria Castle near the huge Neptune Statue that also doubles as a transit vehicle to the docks.
Can be found in the Business District on the left side of the main plaza of Lindblum (where the pickles were sold).
Located on the right side of the main hall of Daguerreo.
Located on the right side of the entrance of Ipsen’s Castle.
Is found in a treasure chest aboard the Invincible Airship once you have access to it.
This last Stellazzio can be found in the exact same place that Scorpio was located in Quan’s Dwelling and only appears after you have obtained and turned in all of the other Stellazzios.
The rewards that you receive are based on how many Stellazzios you have turned in and do not change depending on which specific Stellazzio you have. They are as follows:
Phoenix Pinion
Blood Sword
Elixir
Black Belt
Rosetta Ring
Robe of LordsThe Hammer is used to create the strongest armor in the game for Steiner called 
Tin Armor. This can be created by accessing the Master Synthesist in Memoria (click on the link for more information).
Earning the Queen’s Favor
Once you have returned 10 of Queen Stella’s coins you will automatically earn the Earning the Queen’s Favor Trophy.
What’s Your Sign?
Once you have found all of the coins and obtained the Hammer reward you will automatically earn the What’s Your Sign? Trophy.
