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Electroplating is a method to put a metal coating onto an object, in our case a piece of jewellery, by placing it in a solution containing the metal to be plated and passing an electrical current through the piece and the solution. It is possible to electroplate coatings of most pure metals and even some alloys. In this paper, we shall concentrate on the electroplating of gold and gold alloys and rhodium – one of the platinum group of metals with a good white colour and tarnish resistance - for decorative applications. Electroplating is a comparatively quick and easy process to carry out and does not require major investment in costly equipment. It can be done successfully with very simple, basic equipment. Finished carat gold jewellery may be electroplated with gold for several reasons.... (2002) Complete Story
This soft back book is a practical guide intended for practising goldsmiths and is developed from a number of articles by the authors originally published in AJM magazine. It comprises articles and projects on making and repairing jewellery. Its aim is to show how one can save time and boost profits when making or repairing jewellery through good practice. It features over 200 colour photographs that illustrate the various steps and techniques..... (2002) Complete Story
In many countries, regulations govern the caratage of gold solders used to make jewellery and, with few exceptions, gold solder alloys should be of the same caratage as the jewellery. One problem with the production of solders is to ensure a good colour match with the jewellery being assembled.... (2003) Complete Story
In each step of manufacturing jewelry, there are many factors that can adversely affect quality. Because of this, process control is very important. Investing is one of those steps in which process control is vital. Most investment manufacturers help the investor control the process variables by providing a consistent product, user instructions and technical support. However, improper handling of the investment powder often destroys their efforts. Improper storage, poor water quality, wrong mixing ratios, insufficient mixing methods, uncontrolled temperatures and others can each reduce casting quality and thus cause loss of production and money. This paper will present some data that will show what some factors do to the various investment properties.... (2002) Complete Story
Much of the recent literature on defects that occur in jewelry manufacture is focused on those occurring in lost wax investment casting, However, defects can also occur during casting of ingot and its fabrication into sheet, tube, wire and rod as well as their onward fabrication into jewelry components by processes such as stamping and forging. These defects, along with their causes and prevention, are
briefly reviewed in this article.... (2002) Complete Story
