Hello Lisa, I’m very glad that you chose Mearto for your online appraisal, Considering the photographs, overall pattern, stone composition and the colours, I concluded that this is an Original Specially Designed Necklace by Martin Douglas Kilmer. The piece is very eclectic both in design and in materials. The pieceis also hand signed by the artist. The piece was made by the use of possibly bones, small pieces of marbles, mother of pearl and semi-precious natural stones such as aquamarine. The piece is very dynamic in design, it has a sort of natural flow style through the decoration. The piece has a central piece on it's mid-point, the piece is likely a thin layer of marble or a bone as stated by the owner. The piece is in good conition without any visible problems. Made of Semi Precious Stones and Bone-Marble. Dimensions: 14.45 Oz of Weight, 11 Centimeters of width, 1 Centimeters of hight, 57 Centimeters of length Condition: The piece is in good condition without any visible problems. Provenance: Previously owned by Mrs. Gloria Doan of San Francisco 200-350$. Please don’t hesitate to reach us again for more online appraisals on your precious items, thank you for choosing Mearto.