Wedding And Engagement Ring Set
Fine diamond engagement rings with their matching wedding ring are always sold after they have been re-sized exactly to the right finger size. If the ring & band are re-sized correctly and precisely, both should stay together on the finger and there will be no need for soldering.This way you can always remove or add any of them easily.
In case you have wedding rings decorated by precious stones, any jeweler would recomend you to have your rings soldered together.
He would say: << the constant movement of the two rings against each other would cause the stones to loosen >>.

For your wedding and engagement ring set it is necessary to use one precious metal,the same precious metal,because when you placed together both creating a bad image.
Only buy them as a set pick them out al the same time,you can make sure that the wedding and engagement ring looks great together.
In case you don’t want to hold the engagement ring and the wedding ring together by soldering them to one another, there are other options to consider. For exemple, a snug fit would help. If the rings don’t fit snugly, there are some cheap bands you can buy at wal-mart and the like that go under the ring to make it fit more snugly and this will keep them in place so they can’t move around and come apart. Also,consider the possibility of using a ring guard, if you want to consistently wear your rings as one unit. A ring guard, also known as an insert ring, is one ring with a band that splits into two halves.

Keep in mind, you’ll have more flexibility if you keep them separate. For instance, you can wear just your band(s) when you want to be casual and include your engagement ring for dressier occasions. Once you solder them, there’s no separating them without potential damage.
However, if you want to have warranty or insurance on the wedding and engagement ring set that you buy,pay attention where you buy it. Even if many websites offer you a lot of models of wedding and engagement rings, they can not guarantee a warranty or insurance of the rings. So it’s better to go into a store with a big reputation to make sure that wedding and engagement ring set it’s what you want.