Just engaged! Two people clinking glasses of champagne.

An advisor for your engagement ring

You know she's the one and you're ready to propose, but this ring situation has you stuck. The endless options, the fear of messing it up —it's overwhelming. ChatGPT just gave you a 47-point checklist that only made it worse.

We’re here to help.

Expert Advice. Zero Regrets. 100% Yes.

Custom engagement rings done‑for‑you.

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Best Kept is the engagement ring concierge for a ring she will love at a fair market price.

Close-up of a woman's hand wearing a large diamond engagement ring on her ring finger, held by another person's hand.

Dave Y.

“I was lost. I had never really bought expensive jewelry before. They make it so easy for you and my fiancé loves the ring. Thank you!”

Does this sound like you?

✓ “I’m only doing this once - I want her to love her ring.”

✓ “I want the best and I refuse to overpay.”

✓ “I don’t have the time or interest in endless online research and education.”

You’re in the right place. A straight-forward buying process is what we do.

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Meet Kat.

Founder, Lead Advisor

Kat McCoy wandered into New York City’s Diamond District one afternoon and never left. A former management consultant, she started Best Kept in 2018 to make it easy for men to buy diamond jewelry that their wives and girlfriends would never want to return.

Kat has relationships with top private diamond wholesalers who open their inventory to her clients and master craftsmen who meticulously create each of their custom rings.

Three people gathered around a table in a meeting room, discussing documents. A woman with blonde hair is sitting on the left, a man with gray hair and glasses in the middle, and another man in a checkered shirt standing on the right leaning in.
“I knew that if we could be relentless about making sure the setting aligns with her unique preferences and source the very best-value diamonds for clients to choose from that we could make the ring buying process 1000x better. ”
— Kat McCoy, Founder of Best Kept Concierge
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Portfolio

  • Close-up of a hand with a diamond engagement ring held against a scenic mountain lake landscape with rocky terrain and cloudy sky.
  • A happy couple smiling and embracing on a mountain overlook with a scenic view of mountains and a cloudy sky in the background.
  • Close-up of two hands holding each other, showing an engagement ring with a large central diamond and smaller side diamonds on the ring finger of one hand.
  • A smiling couple taking a selfie outdoors near a mountain lake, with rocky mountains and cloudy sky in the background.
  • Close-up of a hand holding a large rectangular diamond engagement ring with a large central stone and smaller side stones in a silver setting.
  • A smiling couple taking a selfie at the beach. The man is wearing blue sunglasses and a white shirt, and the woman is wearing black sunglasses and a pink dress. There are clouds in the sky, the ocean, and a wooden post in the background.
I want that!

“Kat is like an encyclopedia of engagement rings. She stayed on top of every detail and nailed the design.”

Dave J.

Man kneeling with a ring, woman covering her mouth with hands, outdoor setting, foggy and grassy field.
A silver ring encrusted with multiple diamonds inside a black jewelry box with a velvet lining.

“Retail showed me a 2.2 carat. Kat found me a 2.5 carat, better quality for $4k less. No stress.”

Steve M.

Close-up of hands displaying wedding rings in front of a garden and ocean view.

“I almost pulled the trigger on a generic ring from a big website just to get it off my plate. Best Kept made something infinitely better.”

Jake L.

What sets us apart

  • We work with top diamond wholesalers to access the best stones at incredible value.

  • The way we make money is by charging a flat service fee. This means you’ll never have to feel like we’re upselling you for our own gain.

  • This isn’t a mall jeweler or a faceless mega-site. It’s a white-glove, project-managed process built around your timeline and needs.

  • If she doesn’t love the setting, we’ll remake it once within 30 days with no labor fees.

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A perfect custom ring at a fair market price

The Zero Regret Guarantee:

If she doesn’t love it, we’ll remake your setting once within 30 days

We don’t bargain hunt—we benchmark 

We source directly from private diamond wholesalers. You’ll see market comps and sourcing transparency so you know you paid a fair price for a ring she loves.

What’s included:

  • 1 on 1 Style Session and Investment Analysis with Your Engagement Ring Advisor

  • Personalized design recommendations

  • Personalized diamond shortlist

  • Access to private diamond wholesaler inventory

  • Personalized price benchmarking

  • Custom handmade setting

  • Best Kept Diamond Try-On Kit

  • Lifetime free resizing

  • Personalized wedding band pairing recommendations

  • Zero‑Regret Guarantee — if she doesn’t love it, we’ll remake it once within 30 days, no labor fees

  • Proposal-ready delivery with insured logistics

How It Works

  • A man sitting at a wooden desk engaged in a video call on his laptop with a woman who is smiling. The desk has a notebook, a pen, a smartphone, and a water bottle labeled 'Postmates'. There are potted plants and office supplies in the background.

    Make a Game Plan

    Meet with your expert advisor to put together a plan for your ring that you can feel excited about.

  • Three silver rings with large diamonds are displayed on a pale satin fabric, arranged vertically.

    Choose a design customized for you

    Review your personalized style recommendations and decide on a setting.

  • Close-up of a hand holding a pair of sparkling diamond stud earrings with a blurred neutral background.

    Select your stone from highly vetted options

    We examine upwards of 30 stones to show you the 5 most beautiful and best-value stones to choose from. You’ll also receive a personalized price bench-marking document.

  • A gold ring with a large round diamond center in a blue jewelry box.

    Receive Your Handmade Ring

    Receive your bespoke ring via fully insured 2-day overnight shipping. Your ring will come with an appraisal, certificate and everything you need to make insurance a breeze.

Still discovering what she wants?

Shop our Signature At-Home Diamond Try On Kit!

This game-changing product allows her to try on all 10 diamond shapes at home on her own finger to discover exactly what she wants. It comes with a ring sizer and much more.

The best part? The cost of your kit will be credited towards your service fee - a risk-free investment in your future.

 FAQs

  • It typically takes 5-6 weeks from your initial strategy call to delivery of your dream ring.  On a tight timeline? Let us know and we’ll do everything possible to expedite for you.  

  • The concierge service fee includes two 1-on-1 sessions with your engagement ring advisor, personalized design recommendations, a curated diamond shortlist with price benchmarking, access to private wholesale inventory, a custom handmade setting, lifetime free resizing, wedding band pairing recommendations, a Zero-Regret Guarantee (one remake within 30 days if she doesn't love it), and proposal-ready delivery with insured logistics. 

    Did we mention there’s also an at-home Diamond Try On Kit that can be credited towards your purchase?

  • Yes, a non-refundable deposit of $499 is due to secure your spot and begin services.


  • While many of our clients can save our clients up to 30% off retail costs, we don't optimize for being the absolute cheapest. Instead, we prioritize certainty, taste, and speed at a fair market price.

  • Of course! We work with with couples and individuals.

  • Yes! If you choose to purchase a diamond try-on kit, we will credit the cost of the kit towards your fee. Check out www.bestkept.com to grab yours.

  • Yes, we offer both natural and lab-grown diamonds.

  • Yes! NYC-based clients are invited to select their diamond in person at our office in the Diamond District. For remote clients, we provide a Dropbox folder with photos, videos, and detailed analysis of your curated diamond options.

  • Yes, every ring is handcrafted in New York to your exact specifications, ensuring a unique and personalized piece.

  • Our Zero-Regret Guarantee means that if your partner doesn't love the ring setting, we will remake the setting once within 30 days of delivery, with no additional labor fees.  Any additional stones or materials required for resetting will be available at cost.

  • Yes, we offer lifetime free resizing.

  • All of our rings are custom-made and cannot be returned.  All gemstones are final sale.  Our Zero-Regret Guarantee allows for one setting remake within 30 days of delivery.  

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