Plural Forms of Non-Count Nouns
Non-count nouns have no plural form.
Example:
NO: Yesterday, I bought a ring, a necklace, and some earrings. My new jewelries are beautiful.
YES: Yesterday, I bought a ring, a necklace, and some earrings. My new pieces of jewelry are beautiful.
NO: My teacher gave us three homeworks last week.
YES: My teacher gave us three homework assignments last week.