Its an iphone camera lens attachment. Quality not perfect but it will do for amateur photography. A macro lens for a DSLR will cost a bomb ad you'll probably have to use lighting props due to the shadow cast by the enormous lens!
Great choice to get the lange 1 in white gold! I can imagine that your Lange 1 will be extremely versatile although i think selling the GS with the amazing dial must be a bummer . What's your handle on instagram btw. Would be interested to connect with you!