Ring Sizing: Can a Platinum & Diamond Ring Be Resized?

Question
We purchased a lady's platinum & diamond ring. The center of the ring is set with a .70cts round stone, Set with the center diamond are 62 round cut diamonds, 3 of those round diamonds are set down each side in a channel setting.

What is thoughts about the ability to size this from a 7 to a 4.5-5?  

Answer
Jeff, honestly without seeing the setting of the smaller diamonds (other than the channel set ones on the shoulders of the ring) I cannot fully say what might happen. The best answer is going to come from an experienced bench jeweler who has the ring in hand to provide an educated opinion.

If the stones are in a location where and bending of the ring down from 2 to 2 1/2 sizes will bend the settings, then certainly there is a good chance stones will loosen and some will fall out, if not while the work is done then when the ring is cleaned for the final step.  A jeweler can let you know if a risk of this is likely considering the ring design. And, a price can be provided for tightening and possibly resetting any of the stones which do loosen or fall out.  

The curve of the new size is the problem, considering a section of ring of 5mm to 6 1/4mm must be removed to make the ring the size desired.  The metal is cut out and the ends of the band are then brought together and welded or joined hopefully with a plumb* platinum solder.  This makes the ring either oval or if rounding is do-able it is rounded out.  Rounding opens stone settings which are part of the rounded area.  Maybe you can look at the ring and make a call on whether the stones at the top are going to be affected.

If the ring has hollow interior sections the rounding work will generally apply only to non-hollow sections unless rather substantial to begin with.  Please have an experienced bench jeweler (not a sales person) take a look at the ring.  While I give my thoughts in a general way of what to expect, the jeweler can be specific to your ring.

*plumb means the platinum content of the solder matches that of the ring. Old platinum solders contained no platinum and tended to leave a demarcation line where soldered. In those times, welding was the only truly best means to do the joining of the ring ends.

Jeff, rate me if you want and if you need more info or clarification of some point, please feel free to use the follow-up option.    

God Bless and Peace.  Thomas.