Most of the stones that fall out are pearls. The stone that fell out of the bracelet that I put down on a table was turquoise.One thing I forgot to mention: the jeweler here in Charleston who repairs them thought it might help if the bezels were "heavier". By heavier, I guess the jeweler means making the bezel out of a thicker piece of silver.
I looked at the photo you sent and agree with you that the technique is ugly. I'd rather not use it. I don't want to do anything that would change the way the bracelets look.
One thing I have noticed is that on some bracelets, the top of the bezels seem to curve slightly around the base of the stones, while on others the bezel looks straight. I have always thought that your smiths curve the bezels on purpose. It makes sense to me that a curved bezel holds the stone more securely. Also, the slightly curved bezel looks much more elegant than the straight bezel.
I hope this information is helpful.
Note:
Tolong pastikan bezel agak dilipat atau pakai bezel pakai plat yang lebih tebal lagi sedikit. Sehingga stone tidak gampang lepas. Untuk pearl, pastikan dilem (selalu)