Mark’s journey into fine jewelry began in Napa, California, spanning over four decades into southern Oregon and recently relocating to Brentwood, CA



1973: Harlequin Original Jewelry Designs opened in the newly erected Grape Yard Shopping Center in Napa, California where Mark’s signature design style began to grow and evolve.

1980: Mark receives his Gemologist Diploma from the Gemological Institute of America (GIA).

1983: Mark is awarded the title of Graduate Gemologist Appraiser from the Accredited Gemologists Association (AGA).

1989: Mark wins first prize in the Lazare Kaplan International Diamond Design Contest for his sculpted solitaire diamond ring, which became known as the Harlequin Ring.

2002: Mark relocates to Klamath Falls and establishes Mark London Design, a custom jewelry studio catering to southern Oregon clientele. 

2017: We have relocated to downtown Brentwood, California, to collaborate with K & Co. Family Jewelers. Bringing clients' dreams to life is what motivates us; we look forward to sharing this creative process with you!