This paper reviews the common causes of defects that lead to cracking and the steps that can be taken to minimise their occurrence.
The improvement of the characteristics of yellow gold alloys for jewellery production is a topic gaining increasing interest from the jewellery industry, most notably for hollow jewellery products.
The hardness of sterling silver can be increased to about 150HV with a correct heat treatment carried out industrially. This paper will outline the methods to realize the hardening treatment that allows a substantial
Items of jewellery come into close contact with the skin of many people for a long period of time. During this period they can interact with the skin surface in different ways. In this paper data concerning experimental studies on metal release at different conditions will be analysed.
This memory aims at answering several questions: what is a white gold, how white is a white gold, how the rhodium plating has to be done, etc…
This paper examines the different aspects of gold alloys fineness control, i.e. Assaying methods, marking by the producer or by an independent accredited third party, as well as other ways to guarantee jewellery fineness.
Oxygen content is a critical parameter for success in the production of silver and silver alloy semifinished or finished products. When "not certified" raw materials are used or melting is not carried out with sufficient care, quite frequently poor quality castings are obtained and consequently a high reject rate is observed in the finished product.
Simple and practical methods will be discussed, to facilitate platinum processing for jewellery production. This paper will illustrate tricks that can be implemented immediately: some of them are for general use, while some others are specific for platinum processing.
There are many false beliefs regarding precious metal loss during casting. But are these always actual losses? And if they are not losses, where is the gold going? This paper will discuss these points, and will give suggestions on how to reduce precious metal losses.
This paper will discuss various methods, both traditional and innovative, to produce moulds that enable to obtain a final product with the best quality.