Four gem set items, an 18ct yellow gold ring set with a golden coloured citrine oval cut approximate 4.68ct. Size: L. Weight:6.2 grams. One 18ct yellow gold fine band set with 7 oval cabochon cut pinkish coloured coral. Size: N. Weight: 3.1 grams. A 9ct yellow gold ring set with an oval shaped doublet opal small chip in surface. Size: L. Weight: 3.6 grams. One 9ct yellow gold ring set with a small fresh water pearl and white sapphire. Size:J. Weight: 1.8 grams.(4)
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- Cabochon Cut in Jewellery - A cabochon cut is a type of gemstone cutting where the stone is cut and polished in a convex shape with a flat bottom and a domed top, with no facets. This type of cut is typically used for opaque or translucent stones that have natural patterns or inclusions that are best displayed in this type of cut. Examples of stones that are often cut as cabochons include turquoise, opal, and moonstone.
- Coral - Coral used in jewellery. Coral is a material that is commonly used in jewellery making. It is made up of the skeletons of tiny marine animals called coral polyps. There are many species of coral, but only one group, Corallium, is suitable for carving, and thus can be used in jewellery manufacture. These have a deep red or pink orange skeleton and are known as "noble coral" or "precious coral".
- Doublet and Triplet - A doublet and a triplet are both composite imitation stones, consisting of two or three joined layers. A triplet is made with the crown and base of genuine material, but with a centre layer, usually of glass, the object being to make the stone appear larger than it really is. A doublet consists of only two layers.
Opal doublets are quite common and consist of a thin layer of opal cemented to an opal matrix or black glass.
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