Diamonds - the 4 C's ... Carat, Clarity, Colour & Carat The things you should know about a girls best friend. About Precious Metals Gold, silver, platinum, bronze. Read up on them here. Gold Gold Gold Ancient gold jewellery, the Conquistadors and more. Gemstones Amber, emerald, jade, lapis lazuli, onyx, ruby, sapphire, turquoise.