| Business | Phone |
| Egl European Gemmological 6 W 48th St, New York 10036 | (212) 730-7453 |
| Eric & Son 1212 Avenue Of The Americas, New York 10036 | (212) 354-5025 |
| Cen Corp 7 W 45th St # 704, New York 10036 | (212) 221-8430 |
| Jewelers On Fifth 55 W 47th St, New York 10036 | (212) 593-7171 |
| Jewelry Connection 46 Trinity Pl, New York 10006 | (212) 747-0077 |
| Selljewelry 400 Madison Ave # 5, New York 10017 | (212) 486-6013 |
| Theodore M Baer Inc 608 5th Ave # 706, New York 10020 | (212) 245-6330 |
| Memco Inc 56 W 45th St # 1401, New York 10036 | (212) 921-3336 |
| National Gemmological Lab 15 W 47th St, New York 10036 | (212) 974-2608 |
| Appraisers WorldWide Independent Jewelry Appraiser Gemologist 105 west 55th street, New York 10019 | (212) 470-5126 |
| Appraisers WorldWide Independent Jewelry Appraiser Gemologist 1802 ave w, New York 11229 | (212) 470-5126 |