As a result, the blue colour in the centre, always containing a picture, is surrounded by darker colours of the lower layer of the stone. Nicolo intaglio with the edges cut at acute angles can contrast the colours of both layers of the stone.

When the edges are cut at right angles, only the upper blue layer of stone is visible on the surface of the intaglio. The main changes of shape were shown in a variety of nicolo cutting methods, with one or both colours of the stone being visible on the surface. At the same time, imitations of nicolo intaglio in glass were produced which, with the colour (light blue and black combined) and the shape, followed the changes of the cutting techniques of the original intaglio. Nicolo became popular stone for intaglio carving at the time of the Empire, especially since the Augustan era, and was continuously used until the late antiquity. It is assumed that nicolo can be identified with the antique stone that Pliny the Elder called aegyptilla. It is onyx, of specific bluish white upper layer and very dark brown or black lower layer. Furthermore, we show how the imitations of gems are created with the use of natural or artificial materials. Also, we describe gems with some of their original characteristics modified in certain treatments, most frequently the change of natural gem colour. From the gemmological aspect, a gem is natural if all of its natural features are preserved. This paper highlights the importance of gems, especially in the Ancient World. Р”Р„n interdisciplinary approach to the research of gemmology and archaeology has discovered a variety of information which simultaneously enrich the achievements of both disciplines. RibareviР”вЂЎ-NikoliР”вЂЎ, 'Nikolo intaglio kao primjer znaР”РЊenja i vaР•С•nosti dragoga kamena i njegove imitacije u staklu u antiР”РЊkom periodu', Hercegovina, vol., br. Nikolo intaglio kao primjer znaР”РЊenja i vaР•С•nosti dragoga kamena i njegove imitacije u staklu u antiР”РЊkom periodu. 'Nikolo intaglio kao primjer znaР”РЊenja i vaР•С•nosti dragoga kamena i njegove imitacije u staklu u antiР”РЊkom periodu', Hercegovina, (4), str. 'Nikolo intaglio kao primjer znaР”РЊenja i vaР•С•nosti dragoga kamena i njegove imitacije u staklu u antiР”РЊkom periodu.' Hercegovina, br. 'Nikolo intaglio kao primjer znaР”РЊenja i vaР•С•nosti dragoga kamena i njegove imitacije u staklu u antiР”РЊkom periodu.' Hercegovina, vol.

Nicolo intaglio as an Example of Significance and Symbolism of Gems and Their Glass Imitation in the Ancient World

Intaglio stones