Lab-grown stones over 10 ct remain genuinely rare and command a scarcity premium

Despite steady growth in maximum achievable sizes, lab-grown stones over 10 ct remain genuinely rare, and pricing reflects a real scarcity premium rather than simple per-carat scaling.

• Growth time and defect risk both increase sharply at very large sizes, so yield of a clean, well-proportioned stone over 10 ct from a single growth run is still low.
• This keeps per-carat pricing at this size well above a straight multiple of smaller lab-grown per-carat prices, unlike the fairly linear scaling seen at more common sizes.
• Buyers expecting lab-grown's usual steep discount against natural to hold at every size are often surprised by how the gap narrows at the very top end.

A stone at this size is a genuine special order regardless of growth method. Contact us for realistic pricing and lead time before committing to a specification this large.