In 2016, HUBLOT succeeded in developing and manufacturing large sapphire crystals that were completely transparent and highly scratch-resistant, establishing itself as a pioneer in the processing and coloring of sapphire crystal. This material has enabled the complete transparency of timepieces ranging from the Big Bang Unico and Spirit of Big Bang to the MP-05 La Ferrari, making the watch's structure and movement visible.

HUBLOT has previously introduced colored sapphire crystals, including black smoke, red, and blue. Now, the brand has successfully manufactured a yellow sapphire crystal case by fusing copper (CU) and aluminum oxide (Al2O3). This innovative and difficult-to-process material has given birth to the "Spirit of Big Bang Yellow Sapphire," which radiates with a vibrancy as if capturing the sun's light.

This model is equipped with an automatic chronograph movement, redesigned by HUBLOT based on the renowned "El Primero" caliber.

The completely transparent case, adorned with a sun-like yellow radiance, is paired with a clear yellow strap, creating a cohesive transparent aesthetic for the entire watch.