1. Gem has two meanings. One is "gem", a countable noun. When it is the subject, the number of predicate verbs behind it is determined by the number of jewels (that is, jewels are singular and predicate verbs are singular; Jewel is plural, and the predicate verb is plural); Second, it means "jewelry inlaid with precious stones", usually in the plural. At this time, if used as the subject, the predicate verb is usually plural. For example:

A jewel fell from her ring. He lost a jewel in the ring.

These jewels are her private property. These jewels are her private property.

2. Jewelry (which can also be written as jewelry) is a general term for "jewelry" and "jewelry", which is an uncountable noun and only expresses singular meaning; If used as the subject, the predicate verb is usually singular. For example:

All her jewels were pawned. All her jewels were pawned.

Her glittering jewels set off her delicate complex perfectly. She wears sparkling jewels, which makes her look more beautiful.