A three-stone engagement ring sets a center stone between two smaller ones. It is balanced, sparkling and full of meaning. Here is what the style stands for, where it comes from and how to choose one.
What Is a Three-Stone Engagement Ring?
A three-stone ring has a center diamond with one smaller stone on each side. It goes by several names:
- Trilogy ring
- Trinity ring
- Past, present and future ring
- Trio ring
You can vary the shapes, sizes and metal to make the design your own.
The History of Three-Stone Rings
Rings with three stones have a long history, but the three-stone engagement ring became especially popular in the early 2000s, when a jewelry advertising campaign gave it the meaning "past, present and future." The three stones are also read as friendship, love and fidelity.
The style drew new attention in 2017, when Prince Harry proposed to Meghan Markle with a three-stone ring: a center diamond from Botswana and two side diamonds from Princess Diana's collection.
What to Look For
Proportion
The side stones should frame the center stone, not compete with it. Side stones about a third to a half the size of the center stone are a common choice.
Diamond quality
All three stones affect the look, so they should match well in color and sparkle. Cut matters most, because it decides how the three stones catch light together.
The band
A slim band keeps the focus on the stones and sits well next to a wedding band.

Popular Stone Pairings
Round with round side stones
A symmetrical, classic combination with even sparkle.
Emerald or cushion with pear side stones
Pear side stones curve toward the center and soften its outline.
Oval with tapered baguettes
Baguettes add clean lines and a modern contrast to a brilliant-cut center.
Radiant with trillions
Triangular trillion side stones add bold angles and make the center look wider.
The Pros of a Three-Stone Ring
- More sparkle: three diamonds catch more light than one.
- A stronger center: well-chosen side stones draw the eye to the center stone.
- More presence on the hand: the stones cover more of the finger.
- Room to personalize: mix shapes and sizes, or design your own with our bespoke service.
Things to Consider
A different look from a solitaire
If you want the simplest possible ring, a solitaire may suit you better.
Care
More stones mean more settings to look after. Regular cleaning and a yearly check keep every stone secure and bright.
Find Your Three-Stone Ring
Browse our three-stone engagement rings, or explore all Tang&Co. engagement rings. For a center stone to your exact specification, use our Diamond Curation Service.