Summary
Diamond yield shows how much rough stone becomes a polished gem. Understanding diamond yield helps you estimate final weight, maximize value, and avoid mistakes.
Introduction
Understanding diamond yield is key when buying or cutting rough diamonds. Yield is the percentage of a rough stone that turns into a polished diamond. A 10-carat rough rarely becomes a 10-carat polished gem. You need to know how to estimate yield and anticipate weight loss.
Table of Contents
- What is Diamond Yield?
- Why Rough Diamonds Lose Weight
- Estimating Yield: Practical Examples
- Questions to Ask Your Cutter
- Case Studies
- FAQ
What is Diamond Yield?
- Diamond yield is the percentage of rough diamond that becomes polished.
- A 10-carat rough may produce 4–6 carats polished.
- Think of it like sculpting a statue from marble. Material is removed to reveal beauty.
Learn more about diamond cuts and their impact on yield.
Check GIA Diamond Grading for official standards.
Why Rough Diamonds Lose Weight
- Shape of rough: Irregular stones need more cutting.
- Inclusions and cracks: Flaws are removed for clarity.
- Cut style: Fancy shapes or optimal brilliance reduce weight.
- Safety cuts: Prevent breakage but lose carats.
Example: 12-carat rough may yield only 6.5 carats polished.
See rough vs polished diamond prices for value comparisons.
Track diamond market trends on Rapaport.
Estimating Yield: Practical Examples
- Round brilliant: 40–50% yield
- Oval or pear: 50–60% yield
- Emerald cut: 60–65% yield
Research shows rough stones above 5 carats carry higher weight-loss risk.
Compare this with the diamond clarity guide.
Questions to Ask Your Cutter
- What yield do you expect?
- How will inclusions affect final weight?
- Can you show a pre-visualization scan?
For more tips, see choosing the right diamond cut.
Case Studies
- 8-carat rough → 4.3-carat round brilliant, VS1, G color
- 15-carat rough → 8.5-carat pear, VVS2, H color
These show how yield directly affects final value.
FAQ
Q: Can I estimate yield before buying rough?
A: Yes, using scans and cutter experience. Exact carats cannot be predicted.
Q: Does higher yield reduce quality?
A: Often yes. Cutting for maximum yield may lower brilliance or symmetry.
Q: What is a safe yield percentage?
A: Round brilliants: 40–50%, Fancy shapes: 50–65%
