SIlver has high thermal conductivity. That means that wherever your little rosebud flame is hitting, the heat is being sucked away into the rest of the piece. Working in silver, you have to bring the entire piece up to the melting point of the solder because the solder should be melted by the parts being joined–not by the flame! So, ideally, the flame should envelope the entire piece.
For the size and thickness of your piece, I would use a propane torch (no oxygen) with a large, bushy flame that covers (or almost covers) the entire piece. This is what a large, bushy flame looks like: Harbor Freight propane torch. - YouTube. [Ignore the end of the clip where the flame goes all yellow/orange–that’s when he’s turning it off. You need the big, soft, blue flame.]
My torch (an ancient Sievert) has many heads. On your piece, I would use one perhaps a bit smaller (but not much) than the one in the video. If you still have trouble, your parts are plenty thick to use Easy solder if you use this kind of torch i.e… heat the whole work evenly. In the US, these kind of heads seem to be made for weed-burning and ice-melting…:-)… The only problem is that they make the torches for them with real long necks. I use these big heads on a torch with about a 6" neck. Also helps a lot to have surfaces around the piece reflecting the heat back to it.
For a bracelet with that much metal, you need to work more like a silversmith doing holloware, not like a ‘jeweler’ doing small, delicate items…
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Janet in Jerusalem
PS This would be perfect:
They seem to have them at Walmart with 3 heads:
Both are from www.walmart.com.