DE 20105171 U UPAB: 20010726 NOVELTY - Jewelry stone has a polycrystalline diamond layer (1) produced by gas phase deposition. The layer has an untreated surface (2) after gas phase deposition with several crystal surfaces (4) having different orientations. DETAILED DESCRIPTION - Preferred Features: The orientations of the crystal surfaces are irregularly distributed. Surface (2) is not coated. The diamond layer has a thickness of more than 0.3 mm. The lower side (7) of the diamond layer is ground or polished. The stone has a polycrystalline diamond lower layer. The stone has a white, gray or black color. The gas mixture used in the gas phase deposition comprises less than 3.4 % methane, at least 1.27 % oxygen and at least 95.33 % hydrogen. USE - Used for jewelry. ADVANTAGE - The stone has high brilliancy.