The Monarch Blue diamond ring, set in platinum and rose gold with an oval-shaped Fancy blue mixed-cut 6.06ct diamond, complemented by six pink-hued round diamonds, has an estimate of $3.5-4.5 million.

The Monarch Blue diamond ring, set in platinum and rose gold with an oval-shaped Fancy blue mixed-cut 6.06ct diamond, complemented by six pink-hued round diamonds, has an estimate of $3.5-4.5 million.