Does anyone have a good wholesale source for 18 kt clasps. Several of my customers want me to upgrade the Tahitians I sold them. I used 18 Kt "s hook" style and now they want a bigger box clasp. I have checked Stuller, CGM and Kamal and nothing looks great, plus the 18 kt is sooo limited. Any ideas? Also, where can one get omega style backs for big pearl post earrings?