Quote Originally Posted by Ymal View Post
Perhaps you already knew this and it's just the phrasing that make me thing otherwise, but you can see in the gear description if it can be desynthed or not, so you didn't actually had to get the gear to know that.
Unfortunately there is no way to tell if gear is desynthable or not. The "convertible: yes/no" text only applies to converting to materia from spiritbonding and the general rule for that is that if it isn't craftable it can't be converted. This does not apply to desynthesis as the general rule to desynth has been any non-exclusive item (such as event items are generally exclusive and basic materials such as wolf fang for example) up to whichever item level SE has set it to if it isn't crafted as any equipment crafted has generally always been desynthable so you could desynth i100 and i110 gear before 2.5 came out if you so wanted, it just wasn't cheap or optimal.