Copper is a beautiful versatile metal. But here are some things you might want to know:
Copper oxidizes when exposed to the air and the sweat in your skin. Over time, the bright and shiny "copper" color will develop an antique patina that is duller and browner. This may or may not be desirable depending on the look you are going for. Slow the oxidization process by wiping your copper jewelry with a soft clean cloth before and after each use to keep it clean. You can easily clean oxidized copper jewelry and return it to bright and shiny by soaking it in a mixture of lemon juice and salt for 30-60 seconds, rinse with water, and dry. Try it with a penny. It really works!
A very small percentage of the population (you probably already know who you are) may be hypersensitive to metals including copper and should not wear copper jewelry. If you suspect you may have a copper allergy (usually itching sensation or rash where jewelry touches the skin), discontinue wearing copper jewelry and get tested.
If you do not have metal hypersensitivity, wearing copper bracelets and rings have been known to have healing properties for those suffering from arthritis. For medical use, it is preferable that the jewelry is not coated with a sealing agent so that there is direct contact between copper and skin.
About Stainless Steel
Stainless steel is a durable low maintenance alternative to silver:
Resistant to Corrosion and Oxidation
I use 316L grade stainless steel also known as marine grade stainless steel due to its corrosion resistant and anti-oxidation properties. You could take a shower or go swimming in the ocean in your jewelry without fear of corrosion. Stainless steel is also more durable and less delicate than copper.
Stainless steel contains trace amounts of nickel and iron and therefore may cause a reaction to those hypersensitive to nickel.