Gemstone is the general term for precious or semi-precious stones that have been cut and polished and used as jewellery or ornaments.
Agate is a microcrystalline variety of quartz where the crystals are microscopic. Agate has a mixture of colours, and is often sliced and polished. It can be used in jewellery or as ornaments.
Amber is fossilised tree resin and has a translucent apearance which is quite beautiful. Although tranditionally considered to be amber in colour, amber actually comes in many different colours. Green amber drop earrings in silver or gold are particularly effective. Sometimes, insects get trapped in the tree resin and are preserved in the amber. These make very interesting pieces of jewellery, especially rings.
Amethyst is a variey of quartz which has a distinctive violet colour. It is a lovely stone to wear, and is also very effective in amethyst trees.
Chalcedony is a silica mineral composed of quartz and moganite. It has a translucent, waxy lustre and is usually grey.
Chrysophase is a variety of chalcedony which contains small quantities of nickel, which gives it an apple green colour. Particularly effective set in sterling silver.
Jet is a dense, black stone formed from organic material. Whitby jet is famous around the world, although jet of equal quality can be found along the same coastline, including Bridlington. Worn as jewellery, it has a powerful effect.
Onyx is a form of quartz and comes in almost every colour, with a striped/banding effect. It is a striking gemstone, and is very effective as ornaments.
Rose quartz is a fascinating form of quartz, with distinctive shape of angular prisms. It is translucent with subtle pink colour.
Tigers Eye is a metamorphic rock of the quartz group, and has a silky lustre and a yellow to red/browm colour. It has a wonderful lustre which changes as the stone is moved. It makes most attractive jewellery and ornaments.