The wood comes with a layer of resin which makes the ring waterproof.
The Koa tree produces wood that is regarded as one of the most elegant and exotic of Hawaii's native woods and possesses ancient significance, giving the ring a special meaning. Recognized as one of the highest quality textured woods in the world, the use of Koa wood creates a ring that is light weight, comfortable, and brilliantly unique.
What is Koa?
In the Hawaiian language Koa means brave, bold, fearless and warrior.
Koa or Acacia Koa is a large tree, typically attaining a height of 15-25m (49-82ft) and a spread of 6-12m (20-39ft). In deep volcanic ash, a Koa tree can reach a height of 30m (98ft), a circumference of 6m (20ft), and a spread of 38m (125ft). It is one of the fastest-growing Hawaiian trees, capable of reaching 6-9m (20-30ft) in five years on a good site.