What is cutting yield, and why is it critical in the diamond value chain?

• A. Cutting yield is the ratio of carat price per weight.
• B. Cutting yield is the weight of the finished stone only.
• C. Cutting yield is the ratio of polished weight to rough weight.
• D. Cutting yield is the proportion of stones cut per year.

Answer: (C)

Cutting yield measures how much of the rough diamond’s weight ends up as saleable polished stones. It is calculated by dividing the weight of the finished polished gems by the weight of the rough material before cutting, usually expressed as a percentage.

This is critical in the diamond value chain because it directly impacts production efficiency, costs, and profitability. A higher yield means more of the rough material becomes usable gemstones, reducing waste and lowering the cost per carat of the final product. Conversely, a lower yield increases waste, raises handling and processing costs, and can squeeze margins even if the finished stones fetch strong prices.

Yield reflects not just how much weight survives the cutting process but also how quality and appearance are balanced with weight. Rough with favorable geometry and fewer inclusions can produce more polished weight without sacrificing cut quality or brightness, while poor geometry or inclusions often force compromises that reduce yield. Thus, cutters and buyers pay close attention to yield because it influences planning, pricing, and the overall economics of moving rough material into polished inventory.