What is the hawaiian word for emerald?

There isn't a specific Hawaiian word for "emerald" as the concept of gemstones isn't inherently part of traditional Hawaiian culture.

However, you could use descriptive terms like:

* "Pōhaku ʻōmaʻomaʻo" (literally "green stone")

* "Pōhaku ʻōmaʻomaʻo ʻoluʻolu" (literally "beautiful green stone")

You might also find it interesting to explore the traditional Hawaiian uses of green stones like olivine (ʻōmaʻomaʻo) or jade.