Here's a list:


Name of Stellazio - Location of Stellazio

Aries - Dali's windmill

Taurus - Behind Treno's item shop in the slums

Gemini - Throw 10 gil into the fountain at Treno's entrance 13 Consecutive times

Cancer - Behind the overturned cart near the entrance of Burmecia

Leo - Near the statue of Neptune that transports the party to Alexandria Harbor

Virgo - In Black Mage Village's Inn

Libra - Right side of Madain Sari's fountain

Scorpio - Below the HP/MP restoring spring in Quan's Dwelling

Sagittarius - Left of the Gysahl Pickle cart in Lindblum (during Reconstruction)

Capricorn - In the waters to the right of the entrance to Daguerreo

Aquarius - Right hand chest at the entrance of Ipsen's Castle

Ophiuchus - Collect all 12, then search where Scorpio was found.
Go through the list and cross out the ones you have. You should end up finding the one you've been looking for.