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Shown With 9mm Cushion Aquamarine

Aquamarine Lark Diamond Ring Set with 9mm Fine Cushion Aquamarine

This classic setting features sparkling diamond shoulders that taper towards a dazzling center gemstone (1/15 total carat weight). ... Read More

Metal: 18K White Gold


Size Guide

Order now for delivery by Mon, Oct 11

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 White Gold
Prong metal:
14K White Gold
Average width:
2.0 mm
Rhodium finish:

Accent Gemstones

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

Center Gemstone

Average DimensionsAverage Dimensions:
9.0 x 9.0 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.
August 17, 2021
18k white gold lark diamond ring

I searched many places for a ring but kept coming back to this one. I must say, this ring was exactly what i was looking for. I ordered it with a princess cut and it looks stunning. When i opened the box i actually blurted out "WOAH". They nailed it on this design and i have an extremely happy fiance who won't stop looking at it. ...Read More

August 16, 2021
This is the one!

I had been looking for a long time for the perfect piece of jewelry. I love, love, love this ring! The lab diamond is so beautiful it steals the show. I look forward to purchasing a wedding band. Thank you so much!!! ...Read More

May 11, 2021
Big Dawg 92
Easily my best purchase of 2020

This was an engagement ring for my fiancee. Of all the websites I looked at, this ring fit the look and style she hinted at wanting, without sticker shock like I'd seen other places. This ring shines like nobody's business ...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