Source: 5 Reasons Not to Get Your Engagement Ring Online 
Although buying your engagement ring online can definitely get you a better price, you might be losing out in other ways. Renee Newman, author of the Diamond Ring Buying Guide and the Diamond Handbook, explains the downsides of buying your ring from an online website.
- Trying It On: You can't try the ring on before you buy it to see if it's flattering and comfortable on you.
- Difficult Evaluation of Craftsmanship: It's difficult to evaluate the craftsmanship of the ring from a photo and often impossible because the photo may just be a generic photo of a ring like what you are buying. If a ring is not well made and the diamonds are not well set, you could have problems losing stones and have an uncomfortable ring that snags your clothes.
- Repair Service: Internet sellers normally don't offer free repair service if there is a problem with your ring, whereas many brick and mortar stores will back up the quality
