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Petite Rhiannon Three Stone Diamond Ring (1/4 ct. tw.) in Platinum

$2,190 (Setting Only)

(16)

Diamond Origin: Natural

Order now for delivery by Wed, May 6, depending on center diamond.

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Receive jewelry with every order — up to $700 in lab diamond jewelry when you spend $1,000+.
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Free Lifetime Warranty
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Free 1-Year Resizing

This low-profile solitaire engagement ring showcases the center stone with clean, understated appeal and outstanding everyday wearability.

  • Four-prong setting holds the center stone securely and symmetrically for balanced visual appeal and reliable support.
  • Emerald-cut diamond accents positioned strategically complement and enhance the center stone's brilliance.
  • Gallery wire provides structural support and additional stability beneath the center stone for security and peace of mind.
  • Refined band craftsmanship ensures a polished, elegant appearance from every angle and in any lighting condition.
  • Low-profile design suits active lifestyles and everyday wear with sophisticated appeal while maintaining refined sophistication throughout.

Your Order Includes

  • Free FedEx Shipping
  • Delivered in Discreet Packaging
  • Professional Appraisal
  • Free Lifetime Warranty
  • FSC Certified Wood Box

Ring Information

  • Style: BE1D008-PT
  • Metal: 950 Platinum
  • Width: 2 mm
  • Setting: Four-Prong

Accent Gemstones

Center Diamond

  • This Ring can be set with:
Round
Princess
Cushion
Oval
Emerald
Pear
Radiant
Asscher
Marquise
  • Easy monthly payments with Affirm. From 0% APR financing. Up to 36 months. Subject to credit approval.
  • Special 12 month financing options available with Wells Fargo, subject to credit approval.
  • Layaway options also available.
  • Learn More

Why you'll love it

Low Profile

A setting that makes for a comfortable, snag-free wear.

Extra Secure

Gallery wire adds additional support to the center stone.

Exceptional Durability

The band’s thick width and depth provide strength.

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Why you'll love it

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Reviews

5.0
(16)
Sebastian
3/4/2026

Perfect!.. ...Read More

Peyton
1/5/2026

My fiancée absolutely loves this ring! ...Read More

Talarah Laneyrie
9/9/2025

Exactly what I was after, so beautiful ...Read More

The Brilliant Earth Difference

Our team designs our collections with precision and skill at our San Francisco studio. We know it’s the details that matter most — so we obsess over each one.
Our dedication to quality craftsmanship begins with our responsibly sourced precious metals.
From our Beyond Conflict Free Diamonds® to the most innovative lab diamonds on the planet, our world class gemologists have been sourcing exceptional diamonds with traceable origins for twenty years.
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award-winning
artistry

award-winning
artistry

Our team designs our collections with precision and skill at our San Francisco studio. We know it’s the details that matter most — so we obsess over each one.

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Unmatched
materials & craftsmanship

Unmatched
materials & craftsmanship

Our dedication to quality craftsmanship begins with our responsibly sourced precious metals.

image description

industry-leading
standards

industry-leading
standards

From our Beyond Conflict Free Diamonds® to the most innovative lab diamonds on the planet, our world class gemologists have been sourcing exceptional diamonds with traceable origins for twenty years.

Yes. This ring can be resized. Brilliant Earth offers one complimentary resizing within 60 days, or up to 1 year if the new size falls within the recommended sizing range, and resizing includes free shipping both ways.
This three-stone setting pairs emerald-cut prong-set side stones with a delicate band to frame and accentuate the center gem, creating linear balance and refined sparkle. The side stones add visual weight without overpowering the center gem.
This ring is available in several precious metal options, including platinum, 14K and 18K white gold, 14K and 18K yellow gold, and 14K rose gold. Customers can choose the metal that best complements their center gem and personal style.
Yes. This ring is designed for everyday wear, with prong-set emerald side stones and gallery wire that add support to the center gem, while the band’s substantial width and depth provide durability. The low profile also helps reduce snagging for elevated everyday comfort.
A slim polished band or a half-eternity diamond band complements this three-stone ring for a balanced look, while a straight or slightly contoured band can nestle closely for a cohesive stack. Choose a band width that aligns with the ring’s 2 mm profile to maintain a refined silhouette.