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Shown With 8mm Cushion Aquamarine

Aquamarine Twilight Diamond Ring Set with 8mm Fine Cushion Aquamarine

A dazzling halo of diamonds evokes the soft, glowing light of the setting sun in this spectacular engagement ring (2/5 total carat weight). ... Read More

Metal: 18K Yellow Gold


Size Guide

Delivery by Christmas

Order now for delivery by Tue, Dec 21

Georgetown, Washington DC showroom entryway

Georgetown, Washington DC

3332 Cady's Alley NW
Washington, DC 20007


Daily: 10am–7pm

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Ring Information

18K Yellow Gold
Prong metal:
18K Yellow Gold
Average width:
1.8 mm

Accent Gemstones

Min. carat total weight Min. carat total weight:
Shared Prong
Average ColorAverage Color:
Average ClarityAverage Clarity:

Center Gemstone

Average DimensionsAverage Dimensions:
8.0 x 8.0 mm
Average ColorAverage Color:
Average ClarityAverage Clarity:
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Luxury with a Conscience®

A ring that evokes the happiness of love and partnership is even more joyful when you know that it was sustainably sourced and mindfully produced. From our mission to our unique jewelry designs, everything at Brilliant Earth is held to exceptional standards.

Our engagement ring settings are made-to-order with each one handcrafted for your selected center gem’s unique characteristics to ensure the high quality of the finished piece.
As part of our commitment to protecting the planet, Brilliant Earth is Carbonfree®. We calculated our carbon footprint by assessing the direct emissions of our energy use, including packaging, shipping, and employee travel and commuting. Then we partnered with to offset our carbon emissions by contributing to Tropical Rainforest Conservation in Brazil. We will continue identifying ways to reduce our footprint and offsetting emissions that we cannot eliminate.
We present each Brilliant Earth design in a jewelry box crafted of wood from Forest Stewardship Council (FSC) certified forests—trees that are managed and harvested in a manner that protects and maintains natural communities and respects the rights of workers and indigenous people.
September 19, 2021
Lew's fiancée
The most beautiful ring!

My partner proposed to me with this gorgeous ring and I am in love with it! It's 0.43 Carat, Round, Super Ideal Cut, D Color, VVS1 Clarity Diamond. I love the floral, vintage style of the ring, it feels so unique. It has the most beautiful sparkle and I am so happy to wear this for the rest of my days. ...Read More

June 15, 2021
The Most Beautiful Ring

My fiancé proposed with this ring December 2020. It is such a beautiful setting; it sparkles so much! Mine is yellow gold with a 1 carat oval diamond. Perfection. I couldn't imagine a more beautiful ring to wear the rest of my life. ...Read More

February 8, 2020

I proposed to my fiance with the twilight diamond ring and she loved it. The ring completed an extremely special and important day in our lives and we thank you for it. We could not be happier with the quality and price of the ring. Thank you again! ...Read More

Order Details

*Estimated delivery time if ordered by 2 PM PT Monday

Free FedEx Shipping

Free 30 Day Returns

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.

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Gemstone engagement ring in box