A source for uncalibrated settings who states "custom findings to
the retail jewelry industry at manufacturing prices",
"future findings" 1-866-916-0012. They have alloys to make your own
solder. They will make settings in platinum 14 and 18 kt yellow,
white, green and pink gold. I have not used them. They have a
catalogue for a lot of settings for odd sized stones and will custom
make settings for odd or uncalibrated stones.
Richard in Denver