Precious Stones 

Precious stones or gem stones, are minerals that are known for their beauty, rarity and durability.  In value their are Diamonds, Emeralds. Ruby, Sapphires and the very precious Opals.  Also precious medals have been valued for many years.

                 Diamonds are the most valuble- after stones, because they are the hardest and most beautiful gems.  They are usally colorless, but sometimes a pinkish or yellow color.  They contain carbon in a pure crysilline form.  Diamonds are the hardest gems, they are also the hardest occuring substance.  Because of their extreme hardness, Diamonds have industrail uses, they are also oranmental stones.  They are used in diamond drills and drilling tools that are used on steel.   

                 The Diamond is used in the kinds of equiptment are usally artifical.
And they are produced under high temputures  and pressure - also like the conditions under what natraul diamonds are formed deep into the earth.

                 Emeralds are a variety  of minerals called beryal, made in mica, quartz and granite.  Sometimes they look as small pieces of alluvil, or riverbed, deposits.

                     Rubies and Sapphires are varieties of mineral corundum.  Which is made with aluminum oxide.

               They aare the second hardess stones, after diamonds, and will scratch all stones other then itself ( the diamond).  Rubbies and Sapphires , like diamonds, can be made artifically, though these are not as valuble as the natraul stones.  Rubbies and Sapphires have both been used as the working of watches, as well as being used as jewlery.