The first thing you must consider is the budget range that you can afford. Most diamond jewelers may try to rope you in with their expensive engagement diamond rings showing off its incredible features; do not fall for this, and always stick on to your budget. Consider the future financial goals as well while fixing the budget, as diamond rings are also considered as a good investment in order to secure your future.
Besides, you can always reduce the bill amount, even if the engagement diamond ring design that you desire is very expensive. There are many options for this, and one of the common tricks is to replace accent diamonds with other gemstones or semi-precious stones. This will save you a lot on the bill amount, as diamonds are the most expensive part of a diamond ring.