I love dendrite opal for its graphic nature. Black and white? How can you miss? It comes in many layers of all black to all white so getting a nice mix can be a little difficult. Sometimes the pattern can look like a landscape or sometimes a painting in a Modern Art Museum. The chain is special and hard to get these days, Oxidized sterling silver with wee little gold bits peppered op the chain. This is one of those necklaces that can become a good friend.