Another noticeable point with regard to the jewellery of this period is its astonishing variety. Its decline, and reduction to a monotonous repetition of design, coincides with the disappearance of those artists who possessed the universality of a man like Cellini, and with the division of labour characteristic of modern art and industry. In addition to the enormous quantity used, a distinctive feature of Renaissance ornaments is the preference shown for colour. The placing together of bright-coloured gems with delicately worked gold invariably enriched with polychrome enamels is the fundamental motive of the jewellery of the period. So admirable was the craftsman's taste that each jewel forms in itself a scheme perfect in design and colour, and the rubies, emeralds, and sapphires introduced for the sake of their colour values, serve the composition as a whole without overwhelming it; while the diamond, which comprised almost the sole material of the jewellery of later times, was used only for purposes of contrast. It cannot be said that precious stones had entirely forfeited their mediæval reputation at the period of the revival; but as jewellery was beginning to assume generally the character of mere ornament, the stones which enriched it were naturally chosen rather with an eye to their decorative qualities than for any fancied virtues they might be considered to possess. One of the charms of this old jewellery lies in the setting of its stones, which are mostly table-cut, and fixed in square pyramidal collets. The usual process of setting was to rub the upper edges of the closed and box-like collet over the setting edge of the stone, and occasionally to lay over this an additional ornament in imitation of claws. This manner of beating up or pressing the edges of the collet over the faceted sides of the stone is extremely pleasing, for the stone, with its colour thrown up by a foil or _paillon_, harmonises admirably with the somewhat irregular frame of gold that surrounds it. The art of enamelling, especially where figures are represented in full relief, attains the highest point of perfection. Even when enamels cover the various parts of jewels in a wondrous harmony of colour, the artists of the period contrived with extraordinary tact to leave small portions in gold: the hair of the figures, manes of horses, armour, weapons--glittering points that enhance the beauty of the whole. Translucent and opaque enamels are found side by side employed in different modes with astounding assurance. Extensive use was made of opaque white enamel, always by way of contrast; a favourite device being to enrich with it the edges of tendrils in the form of minute beads, each no larger than a pin's head.