1.66ct Marquise Lab Grown Diamond (Colour G, Clarity VVS2, IGI Certified)

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  • Type: Lab Grown Diamond
  • Shape: Marquise
  • Carat: 1.66
  • Colour: G
  • Clarity: VVS2
  • Polish: Excellent
  • Symmetry: Excellent
  • Fluorescence: None
  • Measurements: 12.36x6.08x3.9mm
  • L/W Ratio: 2.03
  • Table: 59%
  • Depth: 64.1%
  • Certificate: IGI
  • Certificate Number: LG792607176
  • Certificate PDF: View
  • Ethically Handcrafted
  • 1-Year Warranty
1.66ct Marquise Lab Grown Diamond (Colour G, Clarity VVS2, IGI Certified)

Would you like to try on this style in person? Order a 3d print by clicking here!

Inside Diameter US UK Germany Spain France Italy Japan
14 mm 3 F 44 (14.0) 4 44 4 4
14.5 mm 3.5 G N/A N/A N/A 5,5 5
15 mm 4 H 47 (15.0) 6,5 46.5 7 7
15.3 mm 4.5 I 48 (15.3) 8 48 8 8
15.6 mm 5 J 49 (15.6) 9,5 49.5 9 9
16.2 mm 5.5 K 51 (16.2) 10,5 50.5 10 10
16.6 mm 6 L 52 (16.6) 12 52 11 11
16.9 mm 6.5 M 53 (16.9) 13,5 53 12,5 13
17.2 mm 7 N 54 (17.2) 14,5 54.5 14 14
17.8 mm 7.5 O 56 (17.8) 16 55.5 15 15
18.1 mm 8 P 57 (18.1) 17 57 16 16
18.5 mm 8.5 Q 58 (18.5) 18,5 58 17,5 17
19.1 mm 9 R 60 (19.1) 20 59.5 19 18
19.4 mm 9.5 S 61 (19.4) 21 61 20 19
19.7 mm 10 T 62 (19.7) 22,5 62 21,5 20
20.4 mm 10.5 U 64 (20.4) 23,5 63.5 23 22
20.7 mm 11 V 65 (20.7) 25 64.5 24 23
21.0 mm 11.5 W 66 (21.0) 26 66 25 24
21.6 mm 12 X 68 (21.6) 27,5 67 26,5 25
22.0 mm 12.5 Y 69 (22.0) 29 68.5 28 26
22.3 mm 13 Z 70 (22.3) 30 69.5 28,5 27
22.9 mm 13.5 Z+2 72 (22.9) 32 71 32 N/A
23.2 mm 14 Z+3 73 (23.2) 33 72.5 33 N/A
23.6 mm 14.5 Z+4 74 (23.6) 34,5 73.5 N/A N/A
  15 Z+5 N/A 35 75 35 N/A

Our jewelry is securely packaged and shipped with insurance across the globe.

For our made to order styles we are able make the highest quality jewelry with the lowest environmental impact. For all made to order (bespoke) pieces please allow up to 6 weeks to ship as we will make this piece from scratch. If you need your jewelry by a certain date, please reach out before ordering to confirm timelines: help@valleyrosestudio.com.

Top Rated Jewelry: ★★★★★ View Our most recent testimonials →

We offer a highly customized and tailored jewelry experience through one-on-one support with our head jewelry designer Brittany Groshong. We offer extensive email and video calls to assist you at every step in your jewelry shopping journey. Whether you are just getting started or need help bringing your vision to life we offer professional jewelry guidance to make your shopping experience relaxed and enjoyable. Our shopping assistance is offered with zero pressure and we are simply happy to share our love of fine jewelry with our clients. For our engagement ring designs you can expect us to go above and beyond, take a look at our most recent testimonials from our many happy clients. We can tailor each of our ring designs to fit within your budget and design aesthetics for a truly personalized ring.

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Recent Testimonials

★★★★★

100% ! It was a surprise she didn't expect at all, and the ring was far beyond her expectations. We went to the beach and she left the ring at the accommodation, and at one point she said to me, "I miss my ring already." 🥹😂

Emanuela
Romania
★★★★★

Hanalei Bay proposal was a success!! My fiancé says that the ring is everything she dreamed of--she loves it! Thank you so much for all of the effort!

Matt
Florida
★★★★★

Just wanted to let you know that my ring arrived so quickly last week! It is SO PERFECT! I wish that I didn't have to wait 2 more months to be able to wear it all of the time! Thank you so much for working with me on this! I really appreciate it! :)

Jane
Philadelphia
★★★★★

Thank you so much, Brittany.  She absolutely loved the ring. She has no idea. She said "HOW DID YOU KNOW WHAT I WANTED when I didn't even know."  It was such a beautiful day and I am so grateful for all your work to make it perfect and so special. 

Lauren
Oakland
★★★★★

Brittany!!!!!!!! I am BEYOND HAPPY!!!! My rings are absolutely GORGEOUS!!!!!!! The rings you designed for me are definately the most beautiful rings I have ever, ever seen. Thank you for all your hard work, this entire ring design process with you has been a wonderful experience. Every piece of jewelry I own from Valley Rose is so special and beautiful- but my engagement and wedding rings are definately a masterpiece!

Stephanie
Texas
★★★★★

I could not have had an easier experience designing and purchasing the ring for my now-fiancée, especially considering we did the entire process via email. Brittany was responsive, helpful, and provided multiple options that worked within the look and budget I communicated. The ring looks fantastic in person and I'm looking forward to returning for the wedding band.

Michael
★★★★★

The ring turned out beautiful and she is getting lots of compliments.

Thomas
★★★★★

I have always admired Valley Rose and have been obsessed with everything created by Brittany. I told my partner if he ever got me jewelry he had to get valley rose! In my surprise he actually listened and surprised me with the Astrea ring as a promise ring. A year went by and he secretly worked with Brittany to design the most beautiful, classic and effortless engagement ring “the Chloe ring” I am head over heels for him and the rings he bought are a huge bonus. Plus the Chloe ring has the same name as our dogy! All meant to be! I could not be happier he went to Brittany!

Gen
Healdsburg, CA
★★★★★

I just can’t tell you enough how much I love my rings (engagement and wedding bands)!! They are absolutely perfect! And I get so many compliments on them. Thank YOU so much for the wonderful artistry that you do! You have been an absolute pleasure to work with - like working with a best friend, to create one of the most memorable ring sets of my lifetime.

Kristina Morrison
Santa Rosa, CA

Designed by Brittany Groshong

Brittany Groshong is the artist and visionary behind the jewelry design studio Valley Rose. A passion project since 2017, the Valley Rose collection is dedicated to making unique and beautiful jewelry. Valley Rose is coveted the world over for it's use of rare gemstones and innovative silhouettes. Highly sought after for masterful craftsmanship and creative storytelling Brittany's jewelry at it's heart continues to focus on creating unique heirlooms that transcend generations.

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Ethical Materials and Responsibly Made

From the mine to your jewelry box we work hard to ensure fair pay for every member in our supply chain. We focus our efforts on designing with materials that offer full transparency and believe this is a positive first step in bringing about equity and a sustainable future in the jewelry industry.

We offer a variety of alternative ethical gemstones like artisanally mined, certified recycled, lab grown, SCS Sustainably Rated diamonds, and lab grown diamonds made from air pollution. We continue to audit and improve upon our supply chain as the industry evolves. We are forging relationships with suppliers that are working directly with the miners and cutters and improving the industry for the better. 

Our Environmental Commitment

Highest Standard of Craft

From the moment you place your order the exciting production process begins on your special piece of jewelry. First stop is the CAD design where we map out every gemstone and ensure everything fits perfectly. Next step your design is sent to our jewelers in the New York Diamond District where we cast, clip, grind, stone set and polish your piece to perfection. We are a small jewelry studio and keep a very exclusive inventory of ready to ship designs. So unless your piece says “ready to ship” you can expect your jewelry to be made to order just for you. Our “slow jewelry” process allows our studio to make the highest quality and most sustainable jewelry.

Our Unique Process

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