The innumerable light reflections given by this glamorous stone creates a powerful visual effect leaving us spellbound. Yet another extraordinary and rare dial, showcased in this Day-Date manufactured in 1990. The opal displays gold printed writing and no hour markers.The natural stone-made dials showed the “Superlative Chronometer Officially Certified” script at 6 o’clock. This COSC certification establishes that an automatic watch provides an average daily rate of – 4 / + 6 seconds in 24 hours; the Day-Date was the first Rolex wristwatch to display such certification as well as one of the first timepieces ever to do so.The date is enlarged 2.5 times by means of the magnifying Cyclops lens. Moreover, the winding crown allows a quick setting of both date and day of the week.