There is one other issue that explains the lack of popularity of a sterling silver emerald ring. Must buyers would expect a silver emerald ring to be substantially cheaper than a gold emerald ring. Jewelers need to live up to these price expectations, the lower grade emeralds (cheaper) are therefore used in silver emerald rings. The cheaper the emerald gem stone, the more the inclusions and fissures in the stone. This means that the gemstone in your emerald silver ring can crack easily when struck with a slight physical impact. Another important issue is about the phsychological attitude of the buyer. Since a silver ring would not be very expensive, less care and caution is taken when wearing, storing or cleaning a silver emerald gem stone ring. There is no logical reason for this lack of care, but it does occur very frequently.
Once you have understood the above issues related to silver emerald rings, you might still choose to go for a sterling silver emerald ring. There is no design that cannot be made in sterling silver, so your choice is wide. Just remember that the ring will require a little more caring and fussing. Check out some silver jewelry designs that can be made with emeralds or any other gem stone of your choice, the link is: http://sterlingsilver.customjewelry.org.uk/