Platinum 3 Stone Cushion Cut Diamond Engagement Ring

Long's Signature Collection · SKU: FCTH0233

Platinum ring with a cushion cut diamond center stone and bezel set cadillac diamond sides.

  • Platinum
  • Center diamond approx. 5.73ctw., G/SI1
  • Diamond sides approx. .35ctw.
  • GIA Inscribed
  • 11.30 x 9.39 x 6.49

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Our Promise To You

Best of Boston

Named "Boston's Best" in bridal year after year

All Natural

A commitment to natural diamonds for their enduring value

No Commission

Zero pressure to buy with our education-forward approach

Unique & Personalized

Extensive selection of GIA-certified diamonds in all shapes and sizes

What is the difference between natural and lab-grown diamonds?

Service 1

Naturally Rare

Whereas natural diamonds are formed under the earth’s surface over millions of years, lab-grown stones are mass produced and available in abundance.

Service 2

Heirloom Quality

Scarcity and geological history give natural diamonds their symbolic value and enduring appeal. It’s why many view them as generational heirlooms.

Service 3

Long-Term Value

Because they are abundantly available, lab-grown diamonds have little to no resale or trade-in potential. Until they are considered a sound investment, we can’t in good conscience stand behind them!


What Our Customers Are Saying

Wonderful to work with from helping find the perfect style, selecting a great stone, answering my questions and helping make a final decision.

- Daniel C.

After shopping around at other local jewelers, I knew instantly that Long's would make the best partners in helping me find the perfect engagement ring.

- Jonathan B.

I am obsessed with my engagement ring from Longs! My fiancé designed it from scratch, and it could not be more perfect!

- Karlie I.

I went in looking at engagement rings, and they took good care of me. No pressure or upselling, just honest advice.

- Daniel C.

Bought my fiancé’s engagement ring at Long’s. Every single aspect of service, pricing and atmosphere was absolutely top notch.

- Samuel K.

Their customer service is outstanding, and they are so helpful every time I come in. They even clean it anytime I visit which I love!

- Sara C.