Sapphire

 Sapphires wholesale to the trade today for approx. $50 for a 1 cwt stone of very low grade quality to approx. $3,000 for  a one carat example of extra fine quality. ($7,000 for an unheated) . The price goes up to well over $20,000 or more per cwt. for extra fine larger examples. ($40,000 for unheated) The retail price can be several times that, depending on the retailers markup.  

Sapphire is the birth stone for those born in September. Corundum, with traces of iron, titanium, chromium, vanadium or magnesium responsible for the color. Sapphires are 9 on the moh's scale, right behind diamond ( moh's10)
Sapphire is said to bring peace and prosperity to those that own it.
Sapphires are not as expensive as the other corundum, Ruby. The most expensive sapphire to my knowledge sold for approx. $17,00,000.00 at auction.