Lab grown diamond jewellery, made in our own factory
A few recent pieces from the workshop.
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Same stone.
Three more hands in the middle.
How it usually works
- Our factory workshop makes it
- plus a distributor takes a cut
- plus the brand takes another
- plus the showroom's rent goes on top
equals that’s what you get quoted
How it works with us
- Our factory workshop makes it
equals that’s what you pay
Usually 20–30% less than a showroom for the same certified stone. Same look, one less margin.
Lab-grown · made and sold by the same people since 1991
Lab grown diamond jewellery, made in our own Mumbai workshop
SGJ is a manufacturer, not a shop. We cut, set and finish lab grown diamond jewellery at Bharat Diamond Bourse in Mumbai, and we sell it directly to the person who is going to wear it. That is an unusual way round for this trade, and it is the whole reason our pricing works the way it does.
The conventional path a diamond ring takes is long. A manufacturer makes it, a distributor moves it, a retailer displays it, and each of those steps adds a margin. The showroom itself has to be paid for — the rent on a high-street address, the staff, the stock sitting in a case waiting for the right customer. All of that is real cost, and all of it is in the price on the tag. When you buy from the factory workshop that made the piece, none of it applies.
What you are left paying for is the gold, the stone and the work. We think that is the right thing to be paying for.
What we make
- Earrings and studs
- Solitaire studs, halo studs, hoops, huggies and drops. Studs are the piece most people wear daily, so the setting has to hold a stone through years of being caught on a pillow and a hairbrush — we use screw-backs above a certain weight for exactly that reason.
- Rings
- Solitaires, halos, three-stone rings, eternity and half-eternity bands, and cocktail rings. Ring construction matters more than any other piece because it takes the most punishment: the shank, the setting height and the way the stone sits all decide whether it still looks right in ten years.
- Engagement rings
- Where most of our custom work starts. Round, oval, princess, emerald, pear and cushion cuts, in yellow, rose and white gold or platinum. If you are working to a date, say so at the outset and we will tell you plainly whether it can be done.
- Necklaces, pendants and mangalsutras
- Tennis necklaces, solitaire and halo pendants, bridal sets, and mangalsutras in both traditional and contemporary forms. Bridal sets are made as a set rather than assembled from separates, so the stones match across the pieces.
- Men's jewellery
- Studs, rings, chains and bracelets. Men's pieces are built heavier and set deeper — a stone that sits proud on a woman's ring will get knocked out of a man's within a year, so the setting geometry is genuinely different rather than just larger.
What a lab grown diamond actually is
A lab grown diamond is a diamond. Not a simulant, not cubic zirconia, not moissanite — those are different materials that happen to sparkle. A lab grown diamond is carbon in the same crystal lattice as a mined stone, with the same hardness of 10 on the Mohs scale and the same optical properties. It is graded on the same four Cs by the same laboratories, and the certificate is issued on the same terms.
There are two ways to grow one. HPHT — high pressure, high temperature — reproduces the conditions found deep in the earth, pressing carbon into diamond under enormous force. CVD, chemical vapour deposition, works differently: a carbon-rich gas is introduced to a vacuum chamber and the crystal is built up a layer at a time onto a seed. Both are genuine diamond. CVD is generally the route to larger and cleaner stones, which is why it dominates the fine jewellery end of the market.
The practical difference between a lab grown and a mined diamond, for the person wearing it, is cost. The stone is the same. What changed is that growing carbon into diamond is now something that can be done deliberately and repeatably, rather than something you have to find.
Certification and how to check it
Every stone we set is certified by IGI, GIA or HRD. These are independent laboratories, and they are the same ones that grade mined diamonds — a lab grown certificate is not a lesser document, it is the same document with the origin stated on it.
The report number is laser-inscribed on the girdle of the stone, which is the thin band around its widest point. You can read it under magnification and check it against the laboratory's own online database yourself. We would encourage you to: it costs nothing, it takes a minute, and you should not have to take anyone's word for what you are buying.
How an order works
- Tell us what you have in mind. A photo, a sketch, a link, or just the occasion and a budget you are comfortable with. You do not need to arrive knowing the answer.
- We come back with options. A few directions rather than a catalogue, with the stone specification and a factory-price quote for each.
- You approve the stone and the setting. We share the certificate before anything is set, and photographs or video at stages during making.
- We make it. Around two weeks for a custom piece from approval, sometimes less for a simpler setting.
Common questions
- Are lab grown diamonds real diamonds?
- Yes. A lab grown diamond is carbon arranged in the same crystal structure as a mined diamond. It has the same hardness, the same refractive index and the same fire. A gemologist cannot tell the difference by eye or with a loupe — it takes specialist equipment reading growth patterns, and the certificate says so explicitly. What differs is where the carbon crystallised and the production cost that follows from it.
- What is the difference between CVD and HPHT?
- Two ways of growing the same material. HPHT recreates the pressure and temperature found deep in the earth. CVD builds the crystal a layer at a time from carbon-rich gas in a vacuum chamber. Both produce genuine diamond, both are certified by the same laboratories, and both appear in fine jewellery. CVD tends to be the route for larger, cleaner stones; HPHT is often used for smaller sizes and for treating colour.
- Who certifies your stones?
- IGI, GIA or HRD, depending on the piece. These are the same laboratories that certify mined diamonds, applying the same grading scales for cut, colour, clarity and carat. Every stone we set comes with its certificate, and the report number is laser-inscribed on the girdle so you can verify it independently.
- Why is buying from a manufacturer different?
- A piece of jewellery on a retail counter has usually passed through a manufacturer, a distributor and a retailer, each adding a margin, and the shop's rent and staff sit on top of that. We are the manufacturer. When you buy from us the piece goes from our factory workshop to you, so you are paying for materials and craftsmanship rather than for the chain that carried it.
- Can you make a custom design?
- Yes, and it is most of what we do. Send us a photo, a sketch or a link to something you have seen elsewhere. We will tell you honestly whether it is worth making as drawn, suggest changes where the construction would not wear well, and quote you for it. A custom piece usually takes around two weeks from approval.
- How long does an order take?
- Around two weeks for a custom piece, from the point where the design and the stone are agreed. Simpler settings can be quicker. If you have a date to work to — an engagement, a wedding, an anniversary — tell us at the start and we will be straight with you about whether it is achievable.
- Do you make mangalsutras?
- Yes. Mangalsutras are one of the pieces we are asked for most, in both traditional and contemporary forms — single-line, double-line, tanmaniya pendants, and simpler daily-wear designs that survive being worn every day rather than kept in a box. We also make matching earrings and pendants where you want the set to read as one.
- Can I see the piece before I commit?
- We share photographs and video of the piece at stages during making, and you are welcome to visit us in Mumbai. For customers who cannot visit, video is how most of our orders are approved, and nothing is finished without your sign-off on the stone and the setting.
- Where are you located?
- Mumbai. We work out of Bharat Diamond Bourse, which is the trade's own complex in Bandra Kurla Complex, and we are a member of GJEPC, the Gem & Jewellery Export Promotion Council. We serve customers across Mumbai, Thane and Navi Mumbai.
- What if I don't know what I want yet?
- That is the normal starting point, and it is a good reason to message rather than browse. Tell us the occasion, roughly what the person wears already, and whether they favour yellow, rose or white gold. We will come back with a few directions rather than a catalogue, which is a faster way to find the right piece than scrolling.
We are at Bharat Diamond Bourse in Bandra Kurla Complex, Mumbai, and we are a member of GJEPC. We work with customers across Mumbai, Thane and Navi Mumbai, and we are happy to talk through a piece before you commit to anything. The fastest way to start is to send us a message.