Kukaniloko Birthstones: Where Hawaiian royalty was born. Kukaniloko Birthstones State Monument, a sacred site on Oahu, preserves a centuries-old birthplace of royalty. n Central Oahu, there is a 5 acre State Park listed in the National Register of Historic Places known as the Kukaniloko Birthstones State Monument. However, if you are thinking of finding sapphires, diamonds, rubies, and emeralds, then you could have a disappointing experience. There are about 180 stones lying around a half acre site which are more lava rock stones. These lava rock stones were believed to be able to ease labor pain for the noble chieftesses when they give birth to the noble bloodlines. So, these birthstones serve a more important role than just precious stones.