My experience with Palmonas has been very disappointing.
I bought a ring, and it started turning black on the 2nd day itself. Palmonas claims to provide a lifetime warranty on their products, so I asked them to give me just a one-month warranty for my ring. If the ring turned black again within that one month, I requested a refund.
However, they were not ready to take responsibility or any risk for their own product. This was a very bad experience, and I honestly did not expect this from Palmonas.