Signed - Lambert Livingston, Navajo. Vintage Blue Diamond Turquoise Sterling Silver French Hook Earrings Markings “ Sterling” “LL” hallmark Lambert Livingston, Navajo Verified Blue Diamond Turquoise Total Weight ~ 5.6 grams Blue Diamond Turquoise ~ 25 x 15 x 3.5mm Total Drop ~ 4.5cm \\ 1 3/4” Blue Diamond Mine, south of Austin, Nevada produces a very hard light to deep blue turquoise, with an attractive swirl or mottled pattern of light and dark blues. It has brown to black matrix. The mine is located at a high altitude and cannot be mined in the winter months due to the extreme cold and snow. #16616-1/4