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2. Engraved gem - Wikipedia

   en.wikipedia.org/wiki/Engraved_gem

   Perhaps 14th century. An engraved gem, frequently referred to as an intaglio, is a small and usually semi-precious gemstone that has been carved, in the Western tradition normally with images or inscriptions only on one face. [1] The engraving of gemstones was a major luxury art form in the ancient world, and an important one in some later periods.

3. Photogravure - Wikipedia

   en.wikipedia.org/wiki/Photogravure

   Photogravure. Photogravure of Victor Hugo, 1883 by Walery. Photogravure (in French héliogravure) is a process for printing photographs, also sometimes used for reproductive intaglio printmaking. It is a photo-mechanical process whereby a copper plate is grained (adding a pattern to the plate) and then coated with a light-sensitive gelatin ...

4. Cameo (carving) - Wikipedia

   en.wikipedia.org/wiki/Cameo_(carving)

   Cameo ( / ˈkæmioʊ /) is a method of carving an object such as an engraved gem, item of jewellery or vessel. It nearly always features a raised (positive) relief image; contrast with intaglio, which has a negative image. [1] Originally, and still in discussing historical work, cameo only referred to works where the relief image was of a ...

5. Photoengraving - Wikipedia

   en.wikipedia.org/wiki/Photoengraving

   A print made in 1907 from a photoengraved plate. It reproduces a sketch of Parga's castle made by Ludwig Salvator.. Photoengraving is a process that uses a light-sensitive photoresist applied to the surface to be engraved to create a mask that protects some areas during a subsequent operation which etches, dissolves, or otherwise removes some or all of the material from the unshielded areas of ...

6. Color photography - Wikipedia

   en.wikipedia.org/wiki/Color_photography

   Color photography is photography that uses media capable of capturing and reproducing colors. By contrast, black-and-white or gray- monochrome photography records only a single channel of luminance (brightness) and uses media capable only of showing shades of gray . In color photography, electronic sensors or light-sensitive chemicals record ...

7. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   A collection of gemstone pebbles made by tumbling the rough stones, except the ruby and tourmaline, with abrasive grit inside a rotating barrel. The largest pebble here is 40 mm (1.6 in) long. The traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between precious and semi-precious; similar ...