This week, her shop is exhibiting close to 100 pieces of jewelry, sculptures and wall hangings crafted by Tom and Jutta Munsteiner. The German artists are known internationally for their work in mediums such as tourmaline, aquamarine, garnet, rock crystal and gold. Tom Munsteiner is a fourth-generation stone cutter and his father, Bernd, created the Dom Pedro Aquamarine, the largest single piece of cut-gem aquamarine in the world. The 14-inch tall obelisk is on display at the Smithsonian National Museum of Natural History in the same gallery with the legendary Hope Diamond. Munsteiner created a “negative cutting” technique — calculated incisions to best reflect the light within stones — that is a signature of the Munsteiner line.