Princess Alexandra’s Fancy Yellow Diamond Ring: Why Coloured Diamonds Work Best When the Metal Joins In

Princess Alexandra of Hanover announced her engagement to Ben-Sylvester Strautmann in September 2026 with a ring that demonstrates an important coloured-diamond principle: the metal is part of the colour story.

People reported that the Antinori di Sanpietro design centres on a 4.8-carat fancy yellow diamond flanked by trillion-cut diamonds, using both 18k yellow and white gold.

Why mixed metal makes sense here

Yellow gold close to a yellow diamond can visually support warmth rather than neutralise it. Whiter metal around colourless side diamonds can help those stones remain visually distinct.

Coloured diamonds should be chosen for colour first

If you are buying a fancy-colour stone, judge whether you actually love the hue in different lighting conditions rather than treating colour grade as an abstract status marker.

Trillion side stones create a directional frame

The triangular side stones point toward the centre and create a wide composition without requiring a halo.

For more on warm stones, read our champagne diamond trend guide.

Source

People, September 2026: Princess Alexandra’s engagement.