Luxury Jewelry Crafted for Life's Most Meaningful Moments
Curated fine jewelry collections, bespoke custom design consultations, and gift-ready presentation—delivered with boutique-level care from the heart of New York.
Shop by Collection
From everyday luxury to once-in-a-lifetime statement pieces — browse our thoughtfully curated collections designed for every chapter of your story.
The Eternity Bridal Suite
Engagement rings, wedding bands, and anniversary sets — crafted in platinum and 18K gold.
Shop Bridal
Gold Stacking Rings
Delicate 14K gold bands, stackable and effortlessly elegant for the modern professional.
Sapphire Drop Earrings
Ceylon sapphires set in white gold — for evenings that deserve to be remembered.
Custom Locket Pendant
Engraved with your chosen message or initials. A timeless keepsake in solid gold.
Diamond Tennis Bracelet
Pavé-set VS clarity diamonds in 18K white gold. Only 12 pieces available this season.
Custom Design Consultations
Your love story is one of a kind — your jewelry should be too. Our master jewelers work one-on-one with you to design custom engagement rings, anniversary pieces, and heirloom-quality keepsakes from the ground up.
Choose your metal — platinum, 18K yellow, white, or rose gold. Select your gemstone from our curated collection of conflict-free diamonds and precious stones. Add personalized engraving to create a truly irreplaceable piece that carries your story for generations.
1. Discovery Consultation
Share your vision, inspiration, and budget with our jewelry designers — online or in our New York showroom.
2. Collaborative Design
Receive hand-sketched renderings and 3D digital previews before a single stone is set.
3. Master Craftsmanship
Your piece is handcrafted with precision and delivered in our signature luxury packaging, ready to present.
Gift Packaging & Luxury Gifting
Because presentation is part of the gift. Every piece from Keystone Carat arrives ready to give — wrapped in our signature packaging that makes an impression before the box is even opened.
The Keystone Carat Gift Experience
Every purchase arrives in our hand-finished jewelry box, wrapped in ribbon, with a personal gift message card. From Valentine's Day bouquets to corporate appreciation gifts — we handle every detail so you can focus on the moment.
Shop Gift CollectionsSame-Day Gift Wrapping
Need it tonight? Order by 2 PM EST for same-day premium gift packaging on in-stock pieces with local NYC delivery.
Personalized Message Cards
Add a handwritten-style message card with every gift order. We'll include it complimentary with any purchase over $150.
Shop by Occasion
Repair, Maintenance & Jewelry Care
Fine jewelry is made to last a lifetime — and with the right care, it can last several. Whether you've inherited a treasured family piece, have a sentimental keepsake that needs restoration, or simply want to keep your everyday diamonds sparkling, our expert jewelers are here for the long term.
We offer comprehensive jewelry repair, maintenance, cleaning, and restoration services using professional-grade tools and gentle techniques that respect your piece's integrity. Trust us with what matters most.
Prong Re-tipping
Restore worn prongs to secure your precious stones safely.
Professional Cleaning
Ultrasonic and steam cleaning to restore brilliance and luster.
Ring Resizing
Precision resizing for rings in gold, platinum, and silver.
Heirloom Restoration
Careful restoration of antique and inherited family pieces.
Annual Maintenance Plan
Subscribe to our annual care plan for priority servicing, complimentary cleaning visits, and stone inspection twice a year — the smart choice for valuable jewelry owners.
Why Keystone Carat
Keystone Carat was founded on a simple belief: luxury jewelry should be accessible, personal, and backed by expertise you can trust. Based in the Archway Plaza in Lower Manhattan, we bring boutique-level service to an online-first world — combining the intimacy of a neighborhood jeweler with the reach and convenience of a premier digital destination.
Every piece in our collection is sourced from certified suppliers and crafted with integrity — whether you're shopping a ready-to-ship statement necklace, commissioning a custom engagement ring, or entrusting us with an heirloom for restoration. Our team of certified gemologists and master jewelers bring decades of collective experience to every interaction.
Why Customers Choose Us
Real words from real customers who trusted us with their most meaningful purchases. We don't just sell jewelry — we build relationships that last a lifetime.
30-Day Returns
No questions asked returns on all non-custom orders.
2-Year Warranty
Every piece backed by our comprehensive craftsmanship guarantee.
Secure Checkout
256-bit SSL encryption and trusted payment processors only.
Authenticity Cert.
All fine jewelry ships with a certificate of authenticity.
"I commissioned a custom engagement ring for my partner and the entire experience was flawless. The design consultation felt genuinely personal, and the finished ring exceeded every expectation. She cried. I cried. 10/10."
"The gift packaging alone was worth every penny. I ordered a gold necklace for my mother's 60th birthday and Keystone Carat presented it so beautifully. The handwritten card was a lovely touch — she keeps the box on her dresser."
"Brought in my grandmother's sapphire brooch for restoration. The team treated it with such respect and care. I honestly couldn't believe the difference — it looks like it was made yesterday. Exceptional fine jewelry care."
"As someone who was nervous about buying luxury jewelry online, Keystone Carat made me feel completely at ease. The concierge support was responsive, knowledgeable, and genuinely helpful. Will be back for our anniversary."
"I purchased the diamond tennis bracelet as a corporate appreciation gift for our VP and the reaction was priceless. Keystone Carat's branded packaging is genuinely impressive — it looked like it came from a Fifth Avenue boutique."
"The custom engraved locket pendant I ordered for my daughter's graduation was beyond anything I imagined. The quality, the attention to detail, the fast turnaround — this is the gold standard for personalized jewelry online."
Featured Gift Collections
Thoughtfully curated gift collections for every occasion and every recipient — from romantic anniversary gifts to executive appreciation pieces, ready to give and impossible to forget.
Rose Gold Eternity Band
Pavé-set diamonds in 18K rose gold. Symbol of unending love.
The Classic Solitaire
Round brilliant cut 1.0ct diamond, GIA certified, in platinum.
Couples Wedding Band Set
Matching 14K yellow gold bands with comfort-fit interior. Sold as a pair.
Birthstone Pendant Necklace
Genuine pearl or gemstone by birth month in 14K gold setting.
Pavé Snowflake Pendant
Diamond-pavé snowflake in white gold. A seasonal favourite that never goes out of style.
Executive Gold Cufflinks
Solid 14K gold cufflinks with optional monogram engraving. Shipped in branded gift box.
Aquamarine Tennis Bracelet
Natural aquamarines in a classic 14K yellow gold open bezel setting.
Three-Stone Trinity Ring
Past, present, and future — three brilliant diamonds in 18K yellow gold.
Over 300 pieces available online. Free insured shipping on orders over $500.
Need Guidance? Call Our ConciergeLuxury Jewelry for Every Style
Whether you live in minimalist gold or bold evening glamour — we have the perfect piece for how you move through the world.
Minimalist Daily Wear
Dainty chains, slim bands, and everyday stacking pieces in 14K gold for the refined professional.
Shop Minimalist
Bold Evening Looks
Dramatic chandeliers, sculptural cuffs, and statement cocktail rings that command every room.
Shop Bold
Your Perfect Piece Is Waiting
Shop our curated collections online or speak directly with our concierge team to find exactly what you're looking for.
Contact & Concierge
Whether you're ready to purchase, need guidance choosing the perfect gift, or want to discuss a custom design, our team is here for you. We respond within 2 business hours during working hours.
Showroom Address
1400 Archway Plaza, Suite 101
New York, NY 10007