A turquoise collectors dream!  This extremely rare high grade fossil Lone Mountain turquoise necklace by Mary Marie Lincoln was published in Turquoise Treasures by Jerry Jacka in 1975.  The necklace features a total of 735cts of the high grade fossil Lone Mountain turquoise.  The inner strand has 66 beads, the middle strand has 72 beads and the outer strand has 68 beads.  Total length of the necklace is 23".  See attached letter from Barry S. Kues explaining how Lone Mountain turquoise fossils are formed.