Home / Products / Solitaire Ring Setting in 18K Yellow & Platinum - Round 12mm

Solitaire Ring Setting in 18K Yellow & Platinum - Round 12mm

Name: Solitaire Ring Setting in 18K Yellow & Platinum - Round 12mm
Brand: Haejin Jewelry
SKU: 123213:3191:P
Price: 1600.0 USD
Availability: InStock

$1,600.00

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Made to order · Ships in 2–3 weeks

Specifications

Metal & Karat: 18K Yellow & Platinum
Stone Shape: Round
Center Stone Size: 12 Mm
Setting Type: Setting only — center stone not included
Ring Style: Solitaire

Lifetime Warranty

Free Shipping + Free Returns

Made to Order in Brooklyn

100% Recycled Solid Gold

Lab-Grown Diamond Engagement Ring

Sunlight catches the 12 mm round diamond’s fiery dance, casting a warm glow that contrasts softly against the cool gleam of 18k yellow and platinum. This solitaire semi-set ring balances the golden warmth of 18k yellow and 18k yellow and platinum with the crisp edge of 18k yellow and platinum, creating a subtle two-tone frame that feels both modern and intimate.

Crafted with a low-profile setting, the band’s smooth comfort fit ensures it rests naturally against the finger, inviting daily wear without interruption. Each curve is hand-finished in our Williamsburg studio, where precision meets quiet artistry in every detail.

The center stone, sold separately, offers the freedom to select a lab-grown diamond of exceptional clarity and brilliance—an ethical choice that reflects a commitment to sustainability without compromise.

Designed for those who appreciate understated elegance, this ring’s slender band and modest height make it ideal for stacking or wearing alone, while the round shape elongates the finger with classic radiance.

Should resizing be needed, our Brooklyn studio provides expert adjustments to ensure a seamless fit, preserving the ring’s balance and comfort.

Explore this semi-set solitaire in person at our Williamsburg studio or begin your custom design journey online, where thoughtful craftsmanship meets your vision.

Haejin Jewelry stands as a Brooklyn-based atelier specializing in lab-grown diamond engagement rings, blending ethical craftsmanship with refined design to create pieces meant for everyday life and lasting stories.

See how your design comes to life with our Ring Design Online, or start a truly custom piece from scratch in our Williamsburg studio.

Explore our Guides & Education and Stories & Lifestyle for diamond education, care tips, and real studio stories.

Frequently Asked Questions

All of our diamonds are 100% lab-grown. They are chemically, physically, and optically identical to mined diamonds — but more sustainable and conflict-free. Learn more about our sourcing →

Yes! Our Williamsburg, Brooklyn studio is open for appointments. You can try on styles, explore customization options, and meet with us in person. Book an appointment →

At Haejin Jewelry we proudly stand behind every piece with our Lifetime Warranty, covering manufacturing defects, prong tightening, and complimentary cleanings. We also offer returns and exchanges within 60 days of purchase (custom designs may vary). Returns are free with our prepaid shipping label, and in-store purchases can be returned at our Williamsburg studio. Read our full Refund Policy and Warranty →

Lab-grown diamonds are more affordable and sustainable than natural diamonds. They offer the same brilliance and durability, but without the environmental or ethical costs. Learn more about the economics of lab-grown vs natural diamonds →

Yes, we ship worldwide. All orders are carefully packaged and fully insured for transit. Domestic orders within the United States typically arrive within 7 to 14 business days. International shipping times vary by destination, generally 15 to 27 business days. Customs duties and import taxes may apply depending on your country and are the responsibility of the recipient. Contact us before ordering if you have questions about shipping to your location.

Yes — every ring we make uses 100% recycled solid gold. Recycled gold is chemically and physically identical to newly mined gold, but its production avoids the environmental destruction and human rights concerns associated with gold mining. Choosing recycled gold is one of the most meaningful steps you can take toward an ethical engagement ring. It is a commitment we make on every piece, not an optional upgrade.

Yes. Haejin Jewelry is a woman-owned independent studio founded and operated in Williamsburg, Brooklyn, New York. We design and hand-inspect every piece in our studio. As a small independent jeweler, we pour genuine care into every ring — from the sourcing of our recycled gold to the final inspection before it ships to you. When you buy from Haejin Jewelry you are supporting a local Brooklyn business, not a corporate chain.

The number refers to gold purity. 14K gold is 58.3% pure gold mixed with other metals for strength and durability — it is harder, more scratch-resistant, and more affordable. 18K gold is 75% pure gold, giving it a slightly richer, deeper color and a softer feel, but it is more expensive and slightly more prone to scratching over time. For everyday wear engagement rings, 14K is often the practical choice. For those who prioritize the highest gold content and richest color, 18K is worth the premium. Both are available in white, yellow, and rose gold at Haejin Jewelry.

An unset ring setting — also called a mounting — is the metal portion of the ring without a center stone. It holds the diamond or gemstone but is sold separately so you can choose exactly the stone you want. At Haejin Jewelry, our ring settings are designed to be paired with a lab-grown diamond or gemstone of your choice through our online ring builder. This gives you full control over the size, shape, and quality of your center stone.

Most of our settings are designed for a specific center stone shape and size range. Our online ring builder automatically shows you compatible lab-grown diamonds for each setting — so you'll only see stones that will fit perfectly. If you have a specific stone in mind, our team is happy to help you find the right setting match. Contact us or visit our Williamsburg Brooklyn studio for personalized guidance.

Most custom engagement rings are completed within 3 to 4 weeks from the time your order is placed. Rush options may be available depending on the setting and stone selected — contact us to discuss your timeline. All rings are handcrafted by skilled artisans and carefully inspected at our Williamsburg, Brooklyn studio before shipping. We recommend ordering at least 6 weeks before your target date to allow time for sizing adjustments if needed.

Our ring settings are available in sizes 4 through 12, including quarter sizes such as 4.25, 4.5, 4.75, and so on. Half and quarter sizes are available on most styles. If you are between sizes or unsure of your size, we recommend our free ring sizing guide or visiting our Williamsburg Brooklyn studio for an in-person fitting. We can also advise on sizing adjustments after your ring is complete.

Our engagement ring settings are available in 10K, 14K, and 18K gold in white, yellow, and rose, as well as platinum and two-tone combinations. 14K white gold is our most popular choice — it offers excellent durability, a bright white finish, and a lower price point than platinum. 18K gold has a richer color and higher gold content. Platinum is the most durable and hypoallergenic option, ideal for those with metal sensitivities. All metals are 100% recycled solid gold or platinum — never plated.

Yes. Most ring styles can be resized one to two sizes up or down after delivery. Some designs — including eternity bands and rings with stones set all the way around — cannot be resized without affecting the stone setting, so we strongly recommend confirming your size before ordering those styles. If you need a resize, contact us within 60 days of receiving your ring and we will advise on the best approach. We also offer complimentary first-time resizing on select styles — ask us when you order.

Each ring setting is designed for a specific center stone shape and size range. Our online ring builder automatically filters compatible lab-grown diamonds and gemstones for whichever setting you select — so you only see stones that will fit perfectly. Common shapes include round, oval, cushion, emerald, pear, marquise, heart, and radiant. The compatible shape is listed on every setting's product page under Specifications. If you have a stone already and want to find the right setting for it, contact us and we will help you find the perfect match.

Customer Reviews — Haejin Jewelry Williamsburg Brooklyn NYC

Haejin Jewelry is a Brooklyn jewelry studio in Williamsburg creating lab grown diamond engagement rings and fine jewelry with transparency and care. Read verified customer experiences from across Brooklyn and New York City.

5.0 ★ Average
Trusted by couples designing engagement rings in Williamsburg and NYC

Ethical & Transparent
Custom design, clear pricing, and local service

Looking for more than reviews? Explore our engagement rings, custom ring design, and ethical fine jewelry. Learn our story and why Williamsburg couples trust our lab-grown diamond expertise.

See all verified Google Reviews →