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Our Koa Eternity Rings and Accessories are all made with our own private stock of Koa from the Big Island and tungsten, the eternity metal for a shine that lasts forever.  In designing our personal accessories, we focused on creating elegant, classic styles for men and women that will be timeless in their appeal.  We were also committed to creating a line of personal accessories that was exquisitely-crafted and made from the finest materials.

When it comes to selecting Koa, no one has more experience than Martin & MacArthur. After all, we have been making fine Koa furniture longer than anyone else in the history of Hawaii.  We hand-select Koa from private plantations in Hawaii, many of which have existed for over 100 years.  We choose only the finest, curly Koa for our furniture and personal accessories.  We leave the rest of the Koa to everyone else.  We understand that the curly Koa for personal accessories needs to have different characteristics than the curly Koa we use to make our furniture.  When you buy Koa personal accessories from Martin & MacArthur, you are assured of the finest curly Koa available.  No one else can make that claim.  After all, we are the only company distinguished to be "the fine furniture maker of 'Iolani Palace."

Tungsten is the superior metal for rings and personal accessories because it is extremely hard and never scratches. Tungsten is 4x harder than titanium and 10x harder than 18K gold. Tungsten measures 8-9 on the Mohs hardness scale. Diamonds are the hardest, measuring 10 on the Mohs scale. Due to its extreme hardness, our Koa Tungsten personal accessories have a shine that lasts forever. Our Koa-tungsten personal accessories are individually hand-crafted using diamond abrasives and polycrystalline diamond tooling.

In summary, we use the finest materials to make our Koa Eternity personal accessories.  First, we use specially-selected curly Koa from our own private stock.  Second, we only use tungsten, the hardest metal for a shine that lasts forever.

Koa Eternity Rings

Our Koa Eternity Rings are made with our own private stock of Koa from the Big Island and TUNGSTEN, the hardest metal in the world.  Tungsten is so hard and dense that it never dulls or scratches.  Tungsten offers a brilliant shine that lasts forever and never needs polishing, unlike cheap metal alloys like titanium.
We hand-select the finest Koa from private plantations on the Kona side and the Hilo side of the Big Island. We look for Koa with extraordinary curl and figured grain.  Koa grows only in Hawaii.  Koa is the only wood in the world with a fluttering curl pattern that runs counter to the grain.  This curl seems to jump off the wood and creates an undulating wavy pattern that seems 3D.  Because we have been making fine Koa furniture longer than any other company in Hawaii, we are the experts in finding the best Koa.
Our Koa Eternity Rings come in a variety of different styles, an widths for men and women.  


Award-winning designer Mikel is recognized nationally for elegant fine jewelry designs lovingly hand-crafted in gold. These sculptural creations are both modern and meaningful. Mikel resides in Hawaii, where he is heralded as one of the islands most renown designers, with collections featured in many of the finest jewelry stores. The artist spent his childhood in New Orleans and his designing years in New York City, Paris, France and Hawaii. In NYC he studied jewelry fabrication at the Soho loft studio of internationally known designer Hiroko Swornik. Revlon Cosmetics chose Mikel's "Charlie Triangle" design to be marketed world-wide. His work has been featured at Bergdorf Goodman, Saks Fifth Avenue, Hall's, Bloomingdale's, and leading jewelry stores throughout the country. Celebrated for his soulful interpretations in gold and diamond, Mikel's timeless creations speak to the heart and are designed to be cherished forever.