| 摘要 |
A translucent stone cluster effect article (11) for use in jewellery having substantially parallel front (12) and back (13) faces, comprising a relief pattern of faceted projections (14) on its back face (13), the front face (12) being unfaceted. The faceted projections (14) comprising close packed right pyramids with even numbers of sides with an apex angle of between 84° and 96°. The pyramids have four sides, but may have six, eight or more sides and their apexes can be spaced apart by 2.1mm, 2.7mm, 3.1mm or 3.5mm. The front face (12) may be flat, or may have a shallow convex or concave curvature. The faceting may extend to the edge of the article, giving a jagged edge, or may not extend to the edge. The article may be made by cutting intersecting v-shaped grooves at right angles into one face of a disc (101) of translucent material (e.g. cubic zirconia) to form close packed right pyramids. The grooves may be cut by a mutli-bladed cutting wheel (104), coated with hard grit such as corundum or diamond and the facets may be polished after cutting. |
