Guaranteed Brilliant

Guaranteed Brilliant diamonds have been vetted in person by our team of expert gemologists to ensure superior quality and unmistakeable sparkle. These diamonds maintain top grades across the three categories of diamond grading (cut, color, and clarity), boast no fluorescence, tinges, or blue nuance, and maintain excellent polish and symmetry. Additionally, all Guaranteed Brilliant diamonds come with an extended 90-day warranty to ensure satisfaction. Simply put, they are the best of the best.

All Guaranteed Brilliant diamonds are eligible for free 90-day returns for an in-store exchange or full refund. Simply mail your return with our complimentary UPS air shipping with its original documentation.

Your return window begins from the original date your purchase is ready to ship or be picked up, and if you request a special later delivery, your return date will remain the same as its original shipping date. Please note that all Guaranteed Brilliant diamonds are certified and thus, must be returned with the original certificate or a $250 fee will apply.

At Frank Darling, we are committed to procuring superior diamonds in all different shapes and prioritize round brilliant, oval, emerald, elongated cushion and cushion, Asscher, radiant, pear, Marquise, princess, rose, old-European, old-mine, and trillion cut diamonds. However, as only the best of the best diamonds are Guaranteed Brilliant, certain less common shapes may less likely to be available at any given time. For example, a rough diamond with flawless clarity that is completely colorless has a higher chance of being cut into the more common round brilliant or princess cut shapes than a rose cut or old-European cut style thanks to demand for the more popular stone shapes. So, while we strive to maintain a collection of perfect diamonds in every shape our Guaranteed Brilliant inventory is really dependent on availability.

Guaranteed Brilliant diamonds are exclusively GIA certified (the strictest certification organization), and take the process a step further by verifying the quality and sparkle in person. This allows us to ensure that each and every diamond is as beautiful as it is rare.

Most people understand fluorescence as a phenomenon that produces a visible glow after being exposed to certain types of light. You know, like the zany-looking deep sea fish that seem to emit neon colors. But it's not just the fish of the sea that can exhibit fluorescence. Thanks to trace elements of impurities within a stone's crystal structure, diamonds can also exhibit this interesting luminescence.

While many people consider fluorescence to be a unique and interesting characteristic of a diamond, it can often also produce a few undesirable results. Firstly, diamond fluorescence can interfere with the natural beauty of the stone and impart a cloudy look. This, in turn, can affect the color of the diamond and make it appear less sparkly. All Guaranteed Brilliant diamonds are fluorescence free — meaning you can rest easy knowing your diamond will never look milky, cloudy or glow blue in UV light.