This is another great repair for the laser welder. This platinum ring was missing a stone because 2 of the 4 beads holding it in were gone. Platinum has such a high working melting temperature it can be a problem re-tipping stones. You can damage a diamond torching a ring to repair temperatures. Most jewelers use a white gold solder to do those type of repairs.
The laser welder allows you melt metal right were you need it. Working with a .3mm beam, I hit just the tiny bead with a few shots and build it up some with platinum wire. Then I opened the beam to .45mm then .6mm to soften and round the new bead.