The stuff in the pics above.... there is no way to know that it isnt quite 5/6*. Even under a 30x loupe you cant tell....
You can tell how many star rating a hash is by dabbing it and looking at it. . The star rating is based on melting and. The more it melts the more pure it is. Plus the more soluble terpenes too. Using a loupe or scope is irrelevant to the rating.
6* / 5* - full melt and leaves nothing behind. No residue of any kind.
4* 3/4 melt leaves behind back residue from trichome stalks
3* half melt leaves ash and black residue from trichome stalks and plant matter
2* - no melt
1* - garbage
Educate yourself.
It used to be a 5 star rating system until rosin and distilled terpenes came about. That added the 6* rating.
All a loupe will do is show the color of the heads, that they're intact or not and if any macro plant matter is present.
You can definitely tell and taste the difference between all the rated hashes. The better it is the higher the terpene profile. Ie more pungent and flavorful