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IGI & GIA Certified 10,000+ Stones in Stock Same-Day Shipping Live Wholesale Pricing Antique & Rare Cuts API Integration NYC & TEXAS Offices Memo Terms for Trade IGI & GIA Certified 10,000+ Stones in Stock Same-Day Shipping Live Wholesale Pricing Antique & Rare Cuts API Integration NYC & TEXAS Offices Memo Terms for Trade
Upcoming Shows

Meet us on the floor this fall.

01 Shapes

The Diamond Revolution

Discover diamonds presented with exceptional clarity so you know exactly what you're getting.

Round cut lab-grown diamond
01 / 09 Round Diamond
02 Fancy Color

Color, independently graded.

Yellow, pink, blue and green. Every stone is graded on its own merit and certified the same way as every white diamond in our vault.

Pear cut fancy green lab-grown diamond Heart cut fancy yellow lab-grown diamond Radiant cut fancy pink lab-grown diamond Oval cut fancy yellow lab-grown diamond Oval cut fancy brown lab-grown diamond Heart cut fancy blue lab-grown diamond
03 Fine Jewelry

We don't just supply the stone, we set it.

Tennis, eternity, climbers and solitaires, made to order with our own certified diamonds and finished in as little as 4 to 6 days.

Explore the jewelry Design your own
  1. 01StoneFrom our own certified vault
  2. 02CADRender in 24 hours
  3. 03Cast & setIn house, by hand
  4. 04FinishedReady in 4 to 6 days
Shop by category
Bangle Bracelet Earring Engagement Mens Ring Necklace Pendant Wedding Bands
04 The C6 Promise 01/04

The C6 Standard

The Signature of Prestige

Each creation carries an unmistakable identity. Crafted from the finest materials with meticulous attention to detail, every piece stands as a lasting emblem of elegance, power, and permanence.

The C6 Standard
Why C6 Diamonds

Why the trade builds with us.

Jewelers, designers and retailers choose C6 for certified stones, in-house craftsmanship and a team that answers in every time zone.

4Global offices
100%Certified stones
1Roof, seed to setting
IGIGIAWholesale onlyShips worldwide
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01

IGI & GIA certified

Every stone ships with an independent grading report, so what you sell is exactly what you bought.

02

Grown & crafted in-house

From diamond seed to finished jewelry under one roof โ€” full control over quality, timing and cost.

03

Four offices, three continents

New York, Texas, Hong Kong and Surat โ€” view stones in person or by video, wherever you are.

04

Custom sourcing & design

Tell us the shape, size and spec. We source the stones and build your design from CAD to finish.

05

Matched pairs & parcels

Calibrated pairs and parcels selected for tone, cut and proportion, ready for earrings and layouts.

06

Ready-to-ship inventory

Live stock of finished jewelry and loose stones, priced wholesale for verified trade buyers.

Jeweller setting a stone in a ring

Customize Your Jewelry

Follow a four-step process to create a one-of-a-kind jewelry piece according to your preference and style.

Book Virtual Appointment

Whether you need help, our jewellery specialists are here to assist you.

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Specialist presenting a ring in a box
05 @c6diamonds

See the sparkle in motion

Real stones, real light, filmed in our studio. Tap any reel to watch it with sound — or book a virtual appointment to see your diamond live.

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06 Just landed

Fresh Arrivals

A new hand-picked edit from our studio every time you visit — refresh to discover more.

View all designs