YELLOW GOLD gold is always used as alloy, even the yellow gold, get more knowledge about gold by reading this article.
BLACK TANTALUM is an absolutely fantastic metal, one important key point to the Cedric Chevalley’s design success. Read more about Black Tantalum here.
FLAT sides make an impression of having a thicker ring, it make the side more presents. In both cases, flat or roundish sides, to provide comfort, we break the edges by making a radius instead of leaving a sharp edge. In this case, of flat sides, the radius are small and the sides stay flat as much as possible.