The gem bezel is made of 18K solid yellow gold and the rest is made of sterling silver. It is thick, solidly crafted. The top measures 1" in diameter. The length is 2-1/2". It has hallmarks but all marks are unknown to me. The blue gem is natural lapis lazuli. The ball marker deploys when pushed from the back. It is securely held with a spring. The pictures will show the beauty of the piece. Weight 33.2 grams. It is pre-owned and is in excellent condition. Shipping is priority with signature required.