This is the 12126th most frequent Russian word.
изумруды
Emeralds.
In this sentence, 'изумрудами' refers to the gemstones embedded in the earrings.
Она носила серьги с красивыми изумрудами.
She was wearing earrings with beautiful emeralds.
Here, 'изумруды' represents the specific type of gemstone being compared to others.
Изумруды блестели ярче всех других камней.
The emeralds shone brighter than all the other gems.
In this context, 'изумрудами' denotes the specific gemstones for which the mine is well-known.