MadisonDia Ideal Sparkle Index™ MISI – Evaluate Your Diamond's Brilliance
The First and Only Trusted Lab-Grown Diamond Score Calculator(Completely Free and unbiased)
MadisonDia Ideal Sparkle Index™
Understanding the MadisonDia Ideal Sparkle Index™
The MadisonDia Ideal Sparkle Index™ instantly evaluates the brilliance, fire, and overall sparkle of a lab-grown diamond. By simplifying complex gemological data into a 0–100 score, buyers can quickly grasp a diamond’s quality and visual appeal. Our non-linear scoring system highlights differences in cut quality, making it easier to distinguish exceptional diamonds from standard high-quality stones.
| Score | Meaning |
|---|---|
| 93–100 | Exceptional: Maximum sparkle and fire. Premium choice. |
| 85–92 | Excellent: Outstanding performance, nearly indistinguishable from top-tier diamonds to the naked eye. |
| 70–84 | Good: Stable brilliance and fire, offers both beauty and value. Suitable for budget-conscious buyers. |
| 55–69 | Fair: Noticeable compromises in light return. Review carefully before purchase. |
| <55 | Poor: Limited brilliance and fire. Not recommended for investment or daily wear. |
How the Score is Calculated
The score is based on diamond proportions such as table %, depth %, crown angle, and pavilion angle, along with cut quality factors like polish and symmetry. Ideal proportions maximize brilliance and fire by channeling light effectively. The non-linear scoring applies light penalties for small deviations but heavier penalties for extreme ones, mirroring their true impact on sparkle. Girdle thickness is also considered: thin to medium is ideal, while thick girdles may reduce light return. The system also includes a “fire leakage” estimate, indicating how much light fails to return to the eye. A lower leakage percentage means superior optical performance.
Disclaimer: This evaluation is based on MadisonDia’s expertise and is provided for informational purposes only. It is not an official grading. Actual diamond quality may vary. MadisonDia is not a gemological laboratory, and these results should be used as a reference only. We recommend cross-checking with official GIA or IGI certificates.
Why the Score Matters
The MadisonDia Ideal Sparkle Index™ simplifies diamond assessment by combining cut, proportions, polish, symmetry, and girdle quality into a single, easy-to-understand score. The non-linear scale emphasizes the subtle but important differences between nearly perfect diamonds and high-quality stones. While highly valuable as a performance indicator, this score is designed as a supportive tool — buyers must always confirm quality with an official GIA or IGI report.
Frequently Asked Questions – MadisonDia Ideal Sparkle Index™
What is the MadisonDia Ideal Sparkle Index™?
It’s a proprietary scoring system that measures a diamond’s brilliance, fire, and overall beauty. Complex gemological data is simplified into an easy-to-understand score, helping buyers make confident decisions.
How does this calculator work?
By entering table %, depth %, crown angle, pavilion angle, polish, symmetry, and girdle information, the calculator estimates a diamond’s optical performance. The final score combines brilliance and fire leakage analysis.
What is “fire leakage”?
Fire leakage is when light escapes from the diamond instead of reflecting back to the eye, reducing brilliance and rainbow sparkle. Our model shows leakage as a percentage (e.g., “5% leakage” means 5% brilliance loss compared to ideal proportions).
Is this score the same as GIA or IGI grading?
No. The MadisonDia Ideal Sparkle Index™ is an independent performance-based model. GIA and IGI provide official grading reports. This tool translates proportion data into optical performance as a supplementary reference.
What score is considered “good”?
Scores of 90+ indicate exceptional brilliance with minimal leakage. Scores of 80–89 are excellent. Scores below 70 may show optical compromises.
Should I rely on this tool alone when buying a diamond?
No. This tool is a guideline, not a replacement for official grading. Always check the GIA or IGI certificate for verification.
Is this tool only for lab-grown diamonds?
While MadisonDia specializes in lab-grown diamonds, the optical principles apply equally to natural diamonds.
Why did MadisonDia create this tool?
We developed this calculator to bridge the gap between gemological expertise and consumer understanding. By offering a transparent, performance-focused evaluation, we provide modern buyers with a trusted decision-making tool.