This is a beautiful, 18 carat gold necklace (unmarked but tested), circa 1880.The work on the chain itself is stunning, not to mention the teardrop shaped aquamarine accompanied by ruby drops. The necklace from chain to the bottom go the rubies beneath the aquamarine measures 21 inches long. The necklace weighs 16.8 grams. This piece is in excellent condition, and is a study in elegance. Note: White the aquamarine is a lovely aqua color, it is not quite as blue as the photo shows It is opened backed, and I always take my photos on a blue, satin background. I have added another photo of the aqua, taken in morning light, on a white plate, with no enhancement.