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I am in need of a company that has the capability of drilling 1/8 (3mm) diameter holes through smooth flat stones ranging from 1/2-1 (1.25cm-2.5cm) in depth. The stones are composed of some type of quartz rich mineral and are quite hard requiring a diamond drill bit. The holes must be smooth and the stones surface must remain free of defects around the hole. If you think that you can be of service to my company please contact me by e-mail. Thank you for your time. lapidary, stone, drilling lapidary services, stone drilling services