The correct form of verb that agrees with the subject is place.
Jewelers place a high value on emeralds of good quality.
A verb is an action or doing word that is use in a sentence to tell what the subject is doing or the activities that is carried out by the subject.
Therefore, The correct form of verb that agrees with the subject is place.
Jewelers place a high value on emeralds of good quality because it is a plural verb.
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