Plates and panels
45 cm Graduated Oval Diamond Tennis Necklace (85 stones, ~30 ct)
- Bounding box
- 146.3 × 148.6 × 3.0 mm
- Engine
- Precision B-rep
- Parameters
- 27
- Published
- October 9, 2026
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The prompt
Yes. For a 45 cm graduated oval diamond tennis necklace at ±30.00 ct total, with the back stones around 0.20–0.25 ct, I’d build the graduation symmetrically from one dominant centre oval. Interpretation — first working layout: I’d aim for roughly 83–89 diamonds. That gives enough stones to physically achieve the 45 cm length while keeping the total around 30 ct. The exact count will ultimately depend on the actual millimetre lengths of the selected ovals and the articulation/gaps between settings. Position Approx. ct each Qty Approx. total ct Centre 1.00 ct 1 1.00 1st pair 0.80 ct 2 1.60 2nd pair 0.70 ct 2 1.40 Next section 0.60 ct 4 2.40 0.50 ct 6 3.00 0.40 ct 10 4.00 0.35 ct 12 4.20 0.30 ct 16 4.80 Back section 0.25 ct 20 5.00 Near clasp 0.20 ct 12 2.40 TOTAL 85 diamonds 29.80 ct That is very close to your 30 ct target and, aesthetically, I like the progression. The centre doesn't become excessively large; instead you get a beautiful continuous graduation: 1.00 → .80 → .70 → .60 → .50 → .40 → .35 → .30 → .25 → .20 Intuition: I would not make the grading mathematically obvious. When sourcing, I'd grade primarily by millimetre dimensions and visual spread, not just stated carat weight. Two 0.40 ct ovals can have noticeably different lengths, and what Tony will see is the silhouette of the necklace, not the certificate weights. For a 45 cm necklace, I'd also keep the 0.20–0.25 ct stones mainly toward the final back section, because that gives us the stone count necessary to achieve the length without blowing the 30 ct budget. One decision: work from approximately 85 oval diamonds / 30 ct / 45 cm. One assumption to discard: every weight category needs identical dimensions—the visual graduation matters more. Next action: I can work this into a proper jeweller's layout from centre to clasp, numbered Stone 1–85, with target carat + approximate L × W dimensions for every pair, so you can send it directly to your diamond supplier for matching.
Parameters
| Name | Value | Range |
|---|---|---|
| Necklace length | 450 mm | 300 – 600 |
| Gallery band width | 2.6 mm | 1 – 6 |
| Gallery band thickness | 1.2 mm | 0.5 – 3 |
| Stone crown height | 1.8 mm | 0.8 – 4 |
| Centre 1.00 ct length | 7.7 mm | 4 – 12 |
| Centre 1.00 ct width | 5.7 mm | 3 – 9 |
| 0.80 ct length (1 pair) | 7 mm | 3.5 – 11 |
| 0.80 ct width | 5 mm | 2.5 – 8 |
| 0.70 ct length (1 pair) | 6.7 mm | 3.5 – 10.5 |
| 0.70 ct width | 4.8 mm | 2.5 – 8 |
| 0.60 ct length (2 per side) | 6.2 mm | 3 – 10 |
| 0.60 ct width | 4.5 mm | 2.5 – 7.5 |
| 0.50 ct length (3 per side) | 5.8 mm | 3 – 9.5 |
| 0.50 ct width | 4.2 mm | 2.2 – 7 |
| 0.40 ct length (5 per side) | 5.4 mm | 3 – 9 |
| 0.40 ct width | 3.9 mm | 2.2 – 6.5 |
| 0.35 ct length (6 per side) | 5.1 mm | 2.8 – 8.5 |
| 0.35 ct width | 3.7 mm | 2 – 6.2 |
| 0.30 ct length (8 per side) | 4.8 mm | 2.5 – 8 |
| 0.30 ct width | 3.5 mm | 2 – 6 |
| 0.25 ct length (10 per side) | 4.5 mm | 2.5 – 7.5 |
| 0.25 ct width | 3.3 mm | 2 – 5.5 |
| 0.20 ct length (6 per side) | 4.2 mm | 2.2 – 7 |
| 0.20 ct width | 3 mm | 1.8 – 5.2 |
| Clasp length | 10 mm | 5 – 20 |
| Clasp width | 5 mm | 2.5 – 12 |
| Clasp height | 3 mm | 1.5 – 8 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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