The ornamental design for a combined four stone round gemstone arrangement with setting, as shown and described.
FIG. 1 is a top perspective view of a combined four stone round gemstone arrangement with setting in a setting embodying my new design showing the stem in broken lines; and,
FIG. 2 is a top perspective view of a four stone round gemstone arrangement with setting in a second setting embodying my new design, showing the stem in broken lines.
The broken line showing of the stem is for illustrative purposes only and forms no part of the claimed design.