Unlike round brilliant diamonds, which are perfectly symmetrical by nature, elongated shapes like Ovals, Pears, and Marquises are notoriously difficult to cut perfectly. When the mathematical proportions of these diamonds are even slightly off, they develop a prominent "bow-tie" effect. This is a dark, shadow-like band that stretches across the center of the stone, where light completely leaks out instead of reflecting back to your eye.

You might assume that buying a diamond with a standard "Excellent" grade protects you from this light leakage. Surprisingly, it does not.

Currently, the world’s most famous gemological labs, including GIA, do not provide an overall cut grade for fancy shapes—they only grade the stone's Polish and External Symmetry. This means a Pear or Oval could theoretically have severe light leakage and a massive dark bow-tie, yet still receive an "Excellent" rating on its standard paper report.

While breaking news reveals that GIA plans to finally introduce cut grading for fancy shapes by 2027, industry experts already know that this new grading system will remain a "broad umbrella". It will likely encompass stones that still lose a significant percentage of their potential light return.

You don't have to wait until 2027 to guarantee your diamond’s brilliance. The GCAL 8X Ultimate Cut Grade already utilizes advanced, AI-driven optical scanning to scientifically grade fancy shape diamonds today.

To earn an 8X certificate, an Oval, Pear, or Cushion must score "Excellent" in 8 strict parameters. More importantly, GCAL specifically analyzes Shape Aesthetics and Optical Symmetry for these shapes, meticulously ensuring that the diamond is crafted to minimize the bow-tie effect and deliver balanced, edge-to-edge sparkle.

In the past, analytical buyers in Singapore had to rely on a traditional jeweler's loupe or a handheld ASET scope / Ideal scope to manually hunt for light leakage in fancy shapes. Today, when you commission a bespoke GCAL 8X diamonds Singapore with Dianoche, you eliminate the guesswork completely.

Because securing an 8X fancy shape is a premium, custom journey, you don't need to squint through old-school scopes. Instead, every 8X diamond comes with absolute digital proof. Together in our atelier, we will review the high-definition 360-degree video, the optical symmetry scans, and the interactive 3D fire mapping of your commissioned stone directly on our high-res screens before we design your ring.