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Surat · since 2018

Airo Diamonds

Natural and laboratory-grown diamonds, each graded by IGI or GIA, and jewellery made around them.

Explore the collection
A polished round diamond
CertifiedEvery stone is graded by IGI or GIA. Check its report number on the laboratory's own website.
PrecisionPlanned, cut and polished by hand in Surat, the city that cuts most of the world's diamonds.
TrustSee your stone in person or on a live video call, with its report, before you decide.

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Find your shape

The round brilliant returns the most light of any shape: the classic choice.

Round brilliant
See round pieces Have a design in mind? Send us a photo

Our story

From rough to polished, in one city

Airo began in 2018 in Surat. See how a stone is planned, cut and polished before it reaches you.

Our story

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See the stone
before you decide

Come to us in Surat, or book a video call and we will show you the stones under proper light.

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Guides

Know what you are choosing

The four grades on every certificate, how to find a ring size at home, and how to keep a diamond bright.

Every certified diamond is graded on four things. Here is what each grade means, and what you can actually see.

01 · Carat

Weight, not size

One carat is 0.2 grams. A heavier stone is larger, but the shape changes how big it looks from above: a 1 ct oval or marquise looks bigger than a 1 ct round, because more of its weight is spread across the top.

The sizes here are typical for well-cut stones. Every report gives your stone's exact millimetres.

Size grows more slowly than weight: a 2 ct round is only about 26% wider than a 1 ct.

02 · Colour

How white it is

White diamonds are graded from D, no colour at all, down the alphabet as a faint warmth appears.

D, E, F are colourless. G, H are near colourless and look white to almost everyone once set: the best value. I, J show a slight warmth in white metal, and look white in yellow or rose gold.

Laboratories grade colour from the side, where it shows most. From the top, sparkle hides much of it.

ColourlessNear colourlessFaint warmth

03 · Clarity

What is inside

Most diamonds hold tiny natural marks called inclusions: crystals, feathers and pinpoints sealed in as the stone formed. Clarity grades how many there are and how easily an expert sees them at 10× magnification.

From VS2 upward, stones are almost always clean to the naked eye. SI stones can be too; ask us and we will check yours under the loupe on a video call.

Naked eye
Under a 10× loupe

04 · Cut

Where the sparkle comes from

Cut is the quality of the angles and finish. In a well-cut stone, light enters the top, reflects off the lower facets and comes back out to your eye. Cut too shallow or too deep, it leaks out of the bottom and the stone looks dull or dark in the middle.

Round brilliants get a cut grade: Excellent (GIA) or Ideal / Excellent (IGI) is the top. Other shapes are judged on polish and symmetry; ask for Excellent or Very Good in both.

Indian ring sizes, from your own ring or your finger. When you order, send us the millimetres too: sizes differ slightly between jewellers, millimetres never do.

1

From a ring that fits

Lay the ring on a ruler and measure the inside edge to edge, across the widest point, in millimetres.

2

From your finger

Wrap a thin strip of paper or a thread around the base of the finger, snug but able to slide over the knuckle. Mark where it meets, lay it flat and measure.

Your size
–Indian size
US / Canada–
Inside diameter–
Around the finger–

Enter one measurement.

Measure in the eveningFingers are slightly larger later in the day and when warm.
Mind the knuckleIf your knuckle is wide, measure there too and choose a size between the two.
Wide bands fit tighterFor a band wider than 6 mm, go up half a size.
Between two sizes?Choose the larger. Most rings can be resized; ask us first.

Size chart

IndianInside diameterAround the fingerUS

Indian sizes follow the common jewellers' chart. Sizes can differ by about half a size between jewellers.

Clean gently

Soak for 20 minutes in warm water with a drop of mild washing-up liquid. Brush softly behind the stone with a soft toothbrush, rinse, and pat dry with a lint-free cloth.

Store apart

Diamond is hard enough to scratch other jewellery, and other diamonds. Keep each piece in its own soft pouch or compartment.

Take it off

Remove rings for gym work, gardening and heavy lifting, and before swimming pools or cleaning products: chlorine and bleach can weaken gold.

Check once a year

Have a jeweller look at the claws and setting once a year so the stone stays secure. For an Airo piece, ask us.

Questions

Frequently asked

Anything else, ask us on WhatsApp or through the enquiry form. We reply personally.

Surat · since 2018

Our story

Diamonds made in India: cut, polished and certified in Surat, and matched to the people who will wear them.

RoughCutPolished
0of 57 facets

I · Who we are

Born in Surat

Airo began in 2018 in Surat, the city where most of the world's diamonds are cut and polished. We grew up around the craft, and built Airo to bring it straight to you, without layers of middlemen.

II · Our craft

Made in India, facet by facet

Our natural diamonds are shaped from rough by Surat craftsmen. Our laboratory-grown diamonds are grown and finished in India. Both are real diamond, and each is labelled for what it is.

III · Our promise

Certified and clearly labelled

Each stone is graded by IGI or GIA, and every piece is marked natural or laboratory-grown, so you always know what you are buying. The prices you see include GST.

Made in India

Cut and polished in Surat by craftsmen whose work is trusted by jewellers around the world.

Certified and honest

An IGI or GIA grading report, and a clear natural or laboratory-grown label on every piece.

Personal service

From choosing the stone to the final setting, you deal with us directly, at your pace.

Milestones

From Surat,
to you

2018

Founded in Surat

Opened in the diamond capital of the world with a certified collection.

2022

Bespoke studio

Pieces made around a chosen stone by our goldsmiths.

2024

Online showroom

The Airo collection, for clients across India and beyond.

Today

Natural and laboratory-grown

Two collections, both made in India, every piece certified and labelled.

Contact

Write to us

A particular stone, a design of your own, or advice before you choose: tell us and we will reply personally.

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