
About Us About Nelly's & Co. Nelly's & Co. is a leading retail manufacturer of fine diamond jewelry and a reseller of fine pre owned and never worn luxury wristwatches in the heart of the New York Diamond District. We are dedicated to providing you with exceptional diamond jewelry at a fraction of the standard retail stores in addition to our comprehensive service we strive to make your jewelry shopping experience a pleasurable one. Our fine watch division offers you a large selection of fine watches.