| Business | Phone |
| Agatha 159 Columbus Ave # A, New York 10023 | (212) 362-0959 |
| Diamond Inscription Tech 36 W 47th St # 1008, New York 10036 | (212) 819-1278 |
| Didco Inc 516 5th Ave # 206, New York 10036 | (212) 997-5022 |
| Charles Slesinger Inc 609 5th Ave # 908, New York 10017 | (212) 758-0130 |
| Jib Diamonds 62 W 47th St # 411, New York 10036 | (212) 921-2833 |
| L D Diamonds 6 E 46th St # 504, New York 10017 | (212) 302-5008 |
| Rough Diamond Corp 580 5th Ave # 32, New York 10036 | (212) 869-5570 |
| Norman R Sawyer 21 W 46th St, New York 10036 | (212) 221-0300 |
| Eugene Steinmetz 20 W 47th St, New York 10036 | (212) 719-1061 |
| Michael Werdiger Inc 35 W 45th St # 11, New York 10036 | (212) 869-5180 |
| Moti Gems Inc 10 W 46th St # 1409, New York 10036 | (212) 593-1220 |
| Pasna Gems Inc 2 W 46th St, New York 10036 | (212) 354-8539 |