If you’re an aging bachelor and billionaire looking to wed someone half your age, you may want to look into expensive engagement rings. One such individual’s proposal to an ex-model involved a $1.5 million engagement ring. That may seem way out there, but it’s not even close to the most expensive ring in the world.

The Chopard Blue Diamond Ring is the ring that makes any other diamond ring look bad. Set with an enormous, oval-shaped blue diamond, the expensive ring also has diamond shoulders and an 18k white gold band paved with diamonds.

Blue diamond is among the most expensive diamonds in the world. It is found among boron deposits, from whence it derives its shade. This particular gem weighs in at nine carats.

The world’s most expensive ring is valued at $16.26 million, enough to put a dent in the wallets of even the wealthiest individuals.