The black dress has thin straps and a softly curved folded upper edge. Folds gather around the side waist and hip, beside a high front leg opening on the left of the image. Long dark gloves cover the arms. One gloved hand is raised near the head while the other remains low, and a green pendant hangs at the centre of the upper body. Only part of the face is included; the complete hem and footwear lie outside the crop.
Compare the folds and the accessory as different details. The hanging green shape makes a clear colour contrast against the dark outfit, but it does not establish a particular stone. The raised arm also changes the surrounding outline, so this pose is not a complete record of the dress at rest. No date, fibre composition or included accessory set follows from the image.
If this folded outline is the part you want, request a full front view of the exact dress with both arms lowered. Confirm the necklace and gloves separately. That supplies the missing lower and resting views without borrowing a hem, shoes or material claim from another black reference.