Yellow Agate Nugget Necklace Tumbled lemon yellow pebbles of agate will refresh and highlight your favorite look that never goes out of style. Agate: genuine No natural stones are identical and may vary in color Length: 18" NecklacesAreUS is a U.S. boutique brand that strives to design and sell quality assortments of fashion jewelry for the modern American woman. Our designs emphasize unique color and simplistic yet classic look, which complement and go effortlessly with any outfit for work or fun.