http://www.diamondring.com/forums/showthread.php?t=116191
I purchased my platinum wedding ring in Feb this year and this morning I found a huge crack in the ring.

http://www.pricescope.com/idealbb/view.asp?topicID=28236

My fiances Platinum ring broke in the 9 o'clock position while hammering/reshaping after sizing the ring down.  That is what my jeweler told me.  He fixed the break by soldering and you can't  tell by looking at it,  but should I be concerned about its integrety.  Does this happen occationally?  He has 20 years experience and runs a reputable shop. 

Thanks experts

dave s

Comments by Allan Creates
This is what people don’t see, as cast platinum parts might look OK on first glance but could easily be crumble platinum that crumbles like tough cookies. Also referred to as dry metal as when you bend it, it just brakes off instead of bending and has a crystillized look in the brake.

The consumer is never made aware of this, as it is hidden in the shop and never talked about.

Always covered up to save face.

Often times exposed by a simple tap with a cow hyde mallet (not a hammer) on a ring mandrel to round up a ring will cause the ring to separate, and that will be patched up to hide as happened to the above. When a ring is cracked in the crown after the diamonds are installed the repair man is only able to use low grade solder as there is too much danger to burn the diamonds, then the repair is not invisible unless they use rhodium to cover it all up. That doesn’t fix the mess it only camouflages it. Rhodium is often used as the big cover up for messy work.

A patch in one spot is only a temporary fix as when the metal is bad, it is bad all around the ring, and is not noticed until stress is induced.

Many times rings are patched up with solder and welding when being produced to cover up the evidence of bad metal, to get the job out.

Until it goes out to be sized or may even crack when being worn as when you hit something hard or clap your hands when applauding, and you have rings on both hands is enough to shock and crack the ring.

This ring came in to be adapted to our ring clasp. When we prepared the piece to fit it up this is what happened “multiple cracks”.
 
This would never happen with hand-made forged platinum.

This ring is an example of what is out there with cast platinum. As per usual we patched it up with solder (nobody ever lets this information out) it is always patched to cover up.

The problem is the casting process not the alloy used in the platinum.

Poured (cast) platinum is never like compressed forged platinum.