Abstract: A solid core fixture for measuring a workpiece and a method for making the same. The solid core fixture includes a solid core made of a homogeneous material, a skin layer covering the solid core, and a surface material covering a portion of the skin layer. The surface material is machined for measuring the workpiece. The skin layer preferably includes an inner skin covering the solid core, a skin core attached to the inner skin and an outer skin attached to the outer surface of the skin core, the three layers being molded in a single process and cured together. A method of making the solid core fixture includes the steps of fabricating a plug core from a homogeneous material; attaching the plug core to a base; applying a skin layer to the plug core and the base; curing the skin layer; covering a portion of the skin layer, after curing, with a surface material; and machining the surface material for measuring the workpiece.