The boutique
C.R. Park, New Delhi
K-1/48, Lower Ground Floor
C.R. Park, New Delhi 110019
Wednesday to Monday, 11 am to 8 pm
Closed on Tuesdays
In the boutique, or by video from anywhere.
IGI certified
Verify your diamond
Every Diamos diamond comes with its own IGI report. Enter the report number to see it on IGI’s own register.
Opens IGI’s register in a new tab.
Every stone graded, every gram hallmarked.
Every diamond we use is graded by an independent laboratory, and every piece of our gold is tested and hallmarked by another. Here is what you receive, what it means, and how to check it yourself.
Certified, then checked again
Every report can be verified at its source. See how
01 · The laboratory
The International Gemological Institute was founded in Antwerp in 1975 and grades diamonds in laboratories around the world. It was among the first laboratories to grade lab-grown diamonds, and today it is the one most of the industry relies on for them.
IGI has no stake in the stones it grades. Its gemmologists measure each diamond, judge its colour and clarity against fixed standards, and record the result under a unique report number that anyone can look up. That independence is the point: the report would read the same whoever had sent the stone.
02 · Beyond the report
A report gives each diamond a grade, but every grade covers a span. Two stones can share the same colour and clarity on paper and still look noticeably different side by side.
The weaker endA touch warmer, an inclusion more easily found. Still within the grade.
The stones we keepWhiter, cleaner and livelier. The strong end of the same grade.
So before any stone is set, one of our gemmologists examines it in person, and we keep only those from the strong end of their grade. The report tells you what a diamond is. That second look decides whether it becomes a Diamos piece.
03 · What you receive
The report that comes with a piece depends on the size of the diamonds in it. Every diamond is covered, from the smallest accent stone to the centre stone.
Every diamond
under one carat
Certifies the finished piece: its total diamond weight and the grades of its diamonds. Our smaller diamonds are always E or F in colour and VVS to VS in clarity.
How it is linkedThe report number is engraved on the piece itself
Diamonds of
one carat and above
A report for each diamond, with its exact measurements, proportions, colour, clarity and cut, and a plot mapping where its inclusions sit.
How it is linkedThe report number is laser-inscribed on the diamond's girdle
A piece with
both sizes
A Full Diamond Grading Report for each diamond of one carat or more, and a Diamond Jewellery Report for the piece and its smaller stones.
How it is linkedThe jewellery report lists the numbers of the larger stones' reports
Inside the laboratory
I
At IGI, each diamond is weighed on an electronic balance, to the hundredth of a carat.
II
Its length, width and depth are measured to the hundredth of a millimetre, and its proportions mapped: table, crown, pavilion and girdle.
III
Trained graders judge its colour against master stones of known colour, and its clarity at ten times magnification, to fixed standards.
IV
Larger stones have the report number laser-inscribed on the girdle. The report is issued and held in IGI's own records, where anyone can look it up.
04 · Reading a report
A grading report is a record of measurements, set out the same way for every stone. It does not describe beauty, and it does not give a price; it tells you exactly what the stone is, so that you can compare it fairly with any other.
Every grade on it, and what it means, is explained line by line in our diamond guide.
Read a report, line by line05 · Verification
Every IGI report is held in IGI's own online records. You never need to take a printed certificate, ours or anyone's, on trust. It takes about a minute.
It is at the top of your report. You can also read it on the piece, or on the girdle of a larger diamond, with a jeweller's loupe.
Open IGI's verification page at igi.org, or scan the QR code printed on your report.
IGI returns its record of the report, which you can view and download.
Check that every detail matches your printed copy: weight, measurements and every grade.
06 · The gold
The gold is certified too. Every piece is tested at an assaying centre licensed by the Bureau of Indian Standards and struck with three marks before it is sold.
The BIS mark
Tested by a licensed centre, not by the jeweller.
18K750
Purity
The karat, and its gold content in parts per thousand.
AB12C3
HUID
A six-character code for that piece alone, which you can check in the BIS CARE app.
The marks shown are an illustration. More on gold and hallmarking
07 · For the years ahead
Your reports are your piece's record for life. Keep the originals somewhere safe, with a photograph or scan of each. You will want them for insurance, for valuations, and if you ever exchange or upgrade the piece.
Our lifetime exchange and loose diamond upgrades require the original reports, and a loose diamond must still carry its original laser inscription. Without the reports, an exchange may need re-certification at a fee, or may not be possible.
Lifetime exchange termsYes. Diamonds under one carat are certified on an IGI Diamond Jewellery Report for the piece, and each diamond of one carat or more has its own IGI Full Diamond Grading Report.
Yes, clearly. Every IGI report for a lab-grown diamond states that it is laboratory grown, and also notes how it was grown.
Enter its number on IGI's verification page or scan its QR code. IGI shows you its own record, which should match your copy exactly.
For pieces with smaller diamonds, it is engraved on the piece. For diamonds of one carat and above, it is laser-inscribed on the diamond's girdle, visible with a jeweller's loupe.
Not necessarily. Each grade covers a range, which is why our gemmologists examine every stone and keep only those from the strong end of their grade.
You can still view and download IGI's record online with the report number. Please also keep the original safe, as our exchange and upgrade programmes require it.
Yes. Every piece is hallmarked by a BIS-licensed assaying centre, with a unique HUID you can check in the BIS CARE app.
