Emerald is a gemstone and a variety of the mineral beryl, colored green by trace amounts of chromium and sometimes vanadium. Beryl has a harness of 7.5–8 on the Mohs Scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.
Even a small emerald can be of significant value, and generally set in expensive jewellery. If your emeralds are set in earrings or pendants, it is not as vulnerable to taps or damage as it would be in a ring where an accidental tap may cause a break or chip. Jewellers will advise that you choose a bezel set emerald for your ring, as they are a lot more protected than a prong setting, particularly if you wish to wear it everyday.
A majority of Emeralds are treated by oiling with cedar oil. The oil is used for fracture fillling as it has a similiar RI to natural emerald. Traditional oiling is stable but not permanent. An emerald should not require re-oiling for a few decades at least, however day to day expose to household chemicals & light may speed up this process.
In saying that, i wear my emerald everyday. Why? because i want to enjoy my jewellery and i want my children to remember this ring on my hand as i held their hand. I absolutely love jewellery, and i tell all my clients to wear & enjoy it. Most jewellery will out-live you, so why pack it away?