Learn Turkish: Meğerse bu pırlanta, kesim açısından çok daha değerliymiş. - It turns out this brilliant-cut diamond was much more valuable in terms of cut.

The root is açı, which means angle or perspective. By adding the possessive suffix -sı (to link it to the preceding noun), the buffer -n-, and the ablative case -dan (from), you literally get 'from the angle of'. When paired with a bare noun like kesim (cut), it translates perfectly to 'in terms of cut'.

Could I use bakımından instead of açısından in this sentence?

Absolutely. Kesim bakımından and kesim açısından mean exactly the same thing here. Both words are used interchangeably to evaluate something from a specific perspective, and both require the noun before them to remain bare.

Why does the sentence end with değerliymiş instead of değerliydi?

The -miş suffix on değerli (valuable) indicates newly learned information or a sudden realization. It is the perfect grammatical match for the word meğerse (it turns out / apparently) at the start of the sentence. Using değerliydi would imply you already knew it was valuable from your own past direct experience, which would clash with the element of surprise in meğerse.

How is the noun kesim formed from a verb?