JN Premier is a collaborative diamond and jewelry venture founded by Jonathan Nussbaum and Nader Kash. Combining Kash’s discerning taste and focus on fine-quality fancy shape diamonds with Nussbaum’s extensive manufacturing and sales experience, the company helps retailers build assortments suited to their merchandising objectives. Its offerings include loose diamonds in qualities from Flawless to I1 and sizes from 0.

5 to 25 carats, with a focus on round, heart, princess, pear, and marquise shapes. JN Premier also supplies diamond parcels, including round selections in VVS–I2 clarity and fancy shape assortments. Finished products and programs include diamond studs in GIA, SI+, I1, and promotional qualities, as well as classic, price-point jewelry tailored to retailer specifications.

The company provides merchandising services for branded and white-label jewelry programs and access to established loose-diamond and finished-jewelry brands. JN Premier coordinates sourcing and planning to help retailers create a cohesive merchandise mix, emphasizing quality, customer service, and consistency. It is based at 515 Madison Avenue in New York City