7 Best Places to Buy Lab-Grown Diamonds in 2025: Smart, Ethical & Online-First Websites

In 2025, buying a lab-grown diamond isn’t just the modern alternative to mined stones; it’s a statement of smart shopping, sustainability, and self-confidence. But with dozens of online retailers vying for your attention, the question remains: where should you actually buy one?
This list breaks down the best places to buy lab-grown diamonds this year based on platform credibility, pricing visibility, and overall shopping support.

1. Rare Carat

Best for: Transparent comparison, best price, and quality assurance.

Rare Carat has transformed the diamond-buying experience by becoming a full-service brand that rivals top retailers in the industry. It aggregates over 1 million GIA and IGI-certified lab-grown diamonds from trusted sellers across the U.S., ensuring unmatched variety and value, all in one place with zero brand bias or hidden markups.

Whether your budget is up to $1000, $2000, or even $5000, Rare Carat helps you stretch every dollar. Their filters let you view diamonds by cut, shape, fluorescence, and more. Plus, you get a Diamond Price & Quality Report that flags overpaying risks.

What really sets Rare Carat apart is its AI grading tool. It scores every diamond on an 18-point system, detects flaws like milky fluorescence or poor symmetry, and offers side-by-side clarity between different stones. Every ring purchase includes a lifetime warranty and zero hidden fees later.

Their engagement ring builder allows full customization with dozens of modern and classic settings. And their educational blog is packed with smart resources like GIA vs IGI certification, how to customize your ring online, and diamond buying green flags or red flags.
No wonder their Trustpilot and Google Reviews average a perfect 5.0 — the highest in the industry.

2. 1-Carat Lab Diamonds

Focused specifically on the popular 1-carat range, this site is built for shoppers who know what they want and want to see only the most relevant stones. The platform is no-frills but efficient, listing GIA and IGI-certified lab-grown diamonds without unnecessary distractions.

It’s a practical place to shortlist if you’re laser-focused on finding a high-quality lab diamond without navigating thousands of filters. You won’t get extensive customization or wide price comparison tools, but the simplicity has its own appeal for some buyers.

3. Costco

Costco might not be the first name that comes to mind for diamond shopping, but its lab-grown selection has grown in recent years. The platform offers decent pricing for pre-set rings and GIA-certified stones, with the added benefit of a handy return policy.

That said, selection is limited, and customization is not a strength. Still, it’s a valid option for loyal Costco members who want a straightforward deal from a retailer they already trust for big-ticket purchases.

4. Etsy

For shoppers looking for more artistic, vintage-inspired, or handmade lab-grown designs, Etsy is worth a browse. Many independent jewelers offer IGI or GIA-certified stones, and you’ll find a lot of unique styles that don’t look mass-produced.

Caution is key here; since Etsy is a marketplace for individual sellers, you’ll need to vet certifications, policies, and return options carefully on your own.

5. Amazon Jewelry

Amazon’s jewelry section is all about convenience. Some lab-grown diamond listings are certified and priced competitively, especially from top-rated sellers. Prime shipping and easy returns can sweeten the deal for casual buyers.

However, the overwhelming number of listings can make it hard to vet quality unless you know exactly what to look for and buyer responsibility plays a big role here.

6. Macy’s

Macy’s offers a curated selection of lab-grown diamond jewelry, often focusing on fashion-forward styles. The experience is less comparison-focused and more about picking from ready-made designs with broad price tiers.

You won’t get price-per-carat insights or advanced diamond scoring tools, but if you’re drawn to branded collections and in-person shopping support, it’s a decent middle-ground option.

7. Kay

Kay’s growing inventory of lab-grown diamonds is largely pre-set and aimed at buyers who prefer the familiarity of mall-based stores. You’ll find seasonal promotions and store assistance if needed.

Still, the trade-off is minimal grading depth and limited customization. If your priority is getting a lab diamond without delving too deep into specs, it offers convenience over comparison.

Editor’s pick:

If you’re serious about maximizing value, clarity, and control — especially on a major purchase like a diamond, platforms like Rare Carat should be your first stop. With unmatched inventory access, AI-powered analysis, and real human guidance, it’s not just a place to shop. It’s a smarter way to buy.

For niche needs like lab grown stones or handmade pieces only, 1 Carat Lab Diamond and Etsy serve a purpose. But when it comes to making an informed decision without pressure or guesswork, the Rare Carat experience stands out for all the right reasons.

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