This ring has an olive wood interior with crushed turquoise outer strip, all set in a titanium outer band. 
The titanium gives the ring a very lightweight feel making it easy to wear everyday, this metal is also particularly strong so gives a durable.  The olive wood is characterised by beautiful swirls and is not listed as a threatened species.  Olive wood is a by-product of the agricultural industry and so is a sustainable wood choice.

As these rings are made of two different materials and will expand and contract at different rates I do not recommend wearing these in the water.