From the commencement of the seventeenth century Germany began to lose the position which, during the greater part of the century previous, she had occupied as a jewel-producing centre; while the Thirty Years' War, by handicapping her industries, caused the jewellers to seek employment elsewhere. It was mainly from France that the new ideas in the form of ornaments emanated. The French are fortunate in possessing separate words to distinguish different kinds of jewellery: _bijouterie_, a general term applied to all jewellery formed of gold, enamels, and precious stones; and _joaillerie_, used for jewellery composed of stones along with a minimum of metal-work. By the revolution of taste in the later days of the Renaissance the _joaillier_ gradually superseded the _bijoutier_; while the two crafts of the silversmith and the jeweller replaced the ancient craft of the goldsmith. Changes in the mode of wearing clothes, and in the materials employed for them, had an enormous influence on jewellery. In place of the velvet and brocade that prevailed during the Renaissance, damask came to be worn, together with an extravagant taste for lace and ribbons. The wearing of the silken stuffs that began to be issued from the factories of Lyons, and of the lace that formed their accompaniment, necessitated the use of ornaments more in keeping with these materials; with the result that the jewellery of the period assumed an open and lace-like character, suitable also for the display of precious stones. At first coloured stones were used--the ruby, sapphire, and the emerald; but soon the diamond held sole possession of the field. In Renaissance ornaments this latter gem played only a secondary part, and was employed solely for the sake of contrast, but it now appeared as the chief object in view, and formed the ornament by itself, all other parts of the jewel, the setting, and possible addition of other stones, being wholly subordinate to it.