Leeser Diamonds

Leeser Diamonds is the offspring of renowned Dutch company Gassan Diamonds, where Guy Leeser learned the nuances of the industry from his grandfather, legendary diamantaire Samuel Gassan. Guy honed his craft for 31 years at Gassan before establishing his own company at the nexus of the diamond trade: Manhattan’s bustling Diamond District. Samuel’s legacy manifests in Leeser’s exceptional customer experiences—personalized partnerships crafted for every unique need and circumstance. While we remain a small, family operation, our worldwide relationships offer an expansive selection of diamonds and jewelry at globally competitive prices.