But all diamonds get how?

At the moment I'm playing spyro for the ps4

but at the level hang the lost fleet

I'm all completely through but supposedly only at 565 diamonds of 600

I soon have no idea where to look

I've searched in the various corners all the monsters fired

but I can't find any diamonds

do you still have ideas or can you restart the level iwie completely or just this one between world?

Maybe the two videos from this Spyro Wiki article will help you:
https://spyro.fandom.com/wiki/Lost_Fleet