The Gold Nugget Mandarin is a seedless, sweet tangerine; the first new University of California Riverside (UCR) citrus variety to be released for commercial production since the mid-1980s. More than 30 years in the making, the new tangerine -- also known as a mandarin -- received its descriptive name from its bright orange, slightly bumpy rind. But Gold Nugget is particularly regarded for its rich, sweet flavor. Gold Nugget is a cross between two tangerines -- Wilking and Kincy -- non-commercial varieties also developed at UCR. Although the cross was made in the 1950s, it was not until 1975 that now-retired UCR professors Robert K. Soost and James W. Cameron “selected” the individual seedling that showed the greatest promise for commercial development. Each seedling from a cross between two citrus varieties has a unique genetic makeup.