Glass has been used for many centuries in the production of fashion jewellery. Fashion jewellery is – as the word suggests – jewellery that matches the latest fashion trends and unlike real jewellery is much cheaper. The earliest form of fashion jewellery was in ancient Egypt in the style of reconstituted beads. Fashion jewellery is also known by other terms: Rhinestones and rhinestone jewellery can also be classed as fashion jewellery.
A fascinating city is formed
The historical Czech town of Jablonec nad Nisou (German: Gablonz an der Neiße) was first mentioned in the 14th century. The glass industry in the town however had its origins a couple of centuries later. We can assume that the first glass professionals settled in the area in the 16th century. Above all, the existing rich resources that are necessary for the production of glass, were a major factor in the settlement.
Destruction and new beginnings
Fusing (Fusion) is a sophisticated technology, in which various pieces of glasses are fused together. The melting temperature is among other things, dependent upon the composition of the glasses which are to be fused together. There is even the possibility of other temperature-dependent items such as metals to merge together with the glass. Glass fusion also works with colored glass powders, frits and fragments.
A lens is an optically effective element with two light-refracting surfaces. Of which a surface is usually curved as concave or convex. The most important characteristic of a lens or a so-called lens system is the optical image. The critical size of a lens is the focal length the unit is specified in meters, depending on the intended use etc. Thus the distance from the focal plane or the focal point of the lens is defined. The simplest lenses are optically active at both spherical surfaces (surface sections of a sphere). From a historical perspective it is assumed that the first glass lenses were used in the field of optics. They were used as lenses to correct short sight or long sight. Later, the first binoculars and also microscopes were developed. Materials which are suitable for the production of lenses must be made of transparent materials. In addition to glass are also some plastics suitable, such as Polycarbonate. The name of the lenses is defined by the curvature of their surfaces. Each of these surfaces can be concave, convex or flat (plan). Convex lenses have curved surfaces outwards, concave lenses, however, have inner curved surface. With lenses having a flat surface no curvature is present. A very important characteristic of a lens is the principle of reversal of the light path. The focal length is dependent on the curvature radii of the two lens surfaces. There are many different types of lenses. We want to enumerate only a few at this moment.
Glass is a material with a long history. By about 5000 BCE, natural glass called obsidian, was used as a working material. Blades, wedges and scrapers were fashioned and used to make other objects for daily use.
Glass was fashioned into containers in Egypt from approx. 1450 BCE. The Egyptians were the ones who first discovered how to make glass. From that point on, glass making developed in leaps and bounds. In the Roman Empire, villas for the upper-classes were outfitted with window glazing. This was made possible by the invention of the glass blowing pipe in approx. 200 BCE.