| Business | Phone |
| Adee 6001 Montrose Rd # 507, Rockville 20852 | (301) 816-2333 |
| United Diamonds Inc 451 Hungerford Dr # 107, Rockville 20850 | (301) 762-4332 |
| Daviko Inc Rockville 20850 | (301) 217-9191 |
| Elan's Diamonds 12104 Wilkins Ave, Rockville 20852 | (240) 221-0100 |
| Kld Corp 1010 Rockville Pike # 501, Rockville 20852 | (301) 340-0412 |