Professional Lucida© Cut Diamond Size Chart
Carat to MM / MM to Carat Square Lucida Cut Diamond Size Comparison Tool
The Lucida© Cut Diamond is one of the most distinctive and brilliantly engineered fancy cuts available today. Patented by Tiffany & Co. in 1999 and named after the brightest star in a constellation, this proprietary mixed cut features a square outline with broad cut corners. It combines long rectangular step facets on the crown with radiating triangular brilliant facets on the pavilion for a total of 50 facets.
This hybrid design creates a spectacular mix of mirror like reflection and intense fire and brilliance. The result is a stone that offers both the elegant geometry of a step cut and the dazzling sparkle of a brilliant cut, making it a standout choice for anyone seeking sophistication with exceptional radiance. A rectangular version is also available, giving the cut added versatility while maintaining its signature look.
Below you will find professionally compiled carat to millimeter conversion charts along with clear, practical recommendations on depth, table, girdle, culet, and length to width ratios. These will help you confidently choose or advise on the perfect Lucida© diamond every time.
Lucida© Cut MM to Carat Diamond Conversion Charts
0.25 - 5.00 cts
Copyright © AVA DIAMONDS
| LUCIDA CUT © TIFFANY & CO. CARAT WEIGHT | LUCIDA CUT © TIFFANY & CO. MM LENGTH |
|---|---|
| 0.25 | 3.55 - 3.75 mm. |
| 0.3 | 3.80 - 4.00 mm. |
| 0.4 | 4.15 - 4.35 mm. |
| 0.5 | 4.50 - 4.70 mm. |
| 0.6 | 4.75 - 4.95 mm. |
| 0.7 | 5.00 - 5.25 mm. |
| 0.8 | 5.25 - 5.50 mm. |
| 0.9 | 5.45 - 5.70 mm. |
| 1 | 5.65 - 5.90 mm. |
| 1.2 | 6.00 - 6.25 mm. |
| 1.3 | 6.15 - 6.40 mm. |
| 1.4 | 6.30 - 6.55 mm. |
| 1.5 | 6.45 - 6.70 mm. |
| 1.6 | 6.60 - 6.85 mm. |
| 1.7 | 6.70 - 7.00 mm. |
| 1.8 | 6.85 - 7.15 mm. |
| 1.9 | 7.00 - 7.30 mm. |
| 2 | 7.10 - 7.40 mm. |
| 2.2 | 7.35 - 7.65 mm. |
| 2.5 | 7.65 - 7.95 mm. |
| 2.7 | 7.85 - 8.15 mm. |
| 3 | 8.10 - 8.45 mm. |
| 3.5 | 8.55 - 8.90 mm. |
| 4 | 8.95 - 9.30 mm. |
| 4.5 | 9.30 - 9.65 mm. |
| 5 | 9.60 - 10.00 mm. |
Ava Diamonds
Lucida© Cut Diamond on Hand
One of the best ways to truly appreciate a Lucida© cut diamond is to see how it sits on the finger. Its square shape with broad cut corners was designed to deliver balanced finger coverage and a refined, elegant presence that looks both classic and modern.
The 50 facet mixed cut design creates a beautiful combination of soft reflection and bright sparkle that really comes alive on the hand. Many people love how it appears substantial and radiant in real life while maintaining a clean geometric silhouette that flatters every finger size.
What are the Ideal Proportions of a Lucida© Cut Diamond?
The Lucida© is a patented mixed cut that demands precise proportions to achieve its signature blend of step cut reflection and brilliant fire. Because of its unique facet arrangement and square outline with broad cut corners, ideal measurements help maximize light performance while preserving the elegant geometry that makes this cut so distinctive.
What is the Ideal Diamond Depth and Table for the Lucida© Cut?
Achieving the perfect balance of depth and table percentage is essential for the Lucida© cut to return maximum fire and brilliance without appearing dark or overly spread. The following guidelines, developed through extensive gemological experience with this patented cut, ensure the stone displays its legendary sparkle and impressive face up size.
Lucida© Cut Diamond Recommended Proportions Guide
| EXCELLENT | VERY GOOD | GOOD | |
|---|---|---|---|
Table - % | 55% - 62% | 53% - 65% | 51% – 68% |
Depth - % | 60% - 66% | 58% - 69% | 56% - 72% |
Girdle | Thin to Medium | Very Thin to Slightly Thick | Very Thin to Thick |
Culet | None | None to Very Small | Small |
What is the Ideal Lucida© Diamond Length to Width Ratio?
The length to width ratio is one of the most defining features of the Lucida© Cut Diamond. This shape is intentionally cut close to square to create balanced finger coverage, a clean geometric presence, and outstanding brilliance. The ideal ratio centers around 1.00. While personal taste always plays a role, the ratios below have consistently proven to deliver the most balanced, elegant, and desirable appearance that sets a Lucida© apart from every other shape.
| EXCELLENT | VERY GOOD | GOOD | |
|---|---|---|---|
| Length To Width Ratio | 1.00 – 1.05 | 0.98 – 1.10 | 0.95 – 1.15 |