• Premium Jewellery – Premium jewellery includes costly jewellery items made with gemstones (diamond, sapphire, ruby, and pearls) and precious metals (gold, platinum, nickel, cadmium, and silver).
• Art Jewellery - Art jewellery is created with a variety of materials not just precious metals and gems. There is also a growing demand for Art jewellery where design and creativity is prized above material value. In addition with precious metals and gemstones, glass, wood, plastics and clay are also used in making Art Jewellery.
• Costume Jewellery – Costume jewellery is generally less-costly, made from less-valuable materials. Its variations includes wire sculpture (wrap) jewellery, using anything from base metal wire with rock tumbled stone to precious metals and precious gemstones.

quoted from: articlecity.com