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Round|Lab Grown|IGI

1.20ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG759507345

Shape and cutting style on the report: Round brilliant

Certificate IGI LG759507345

Diamond specifications and retailer prices

From £144 GBP
$193 USD
As of October 29, 2026
Save £729 GBP (84%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £873 GBP at Reve Diamonds · As of October 30, 2026
View at Reve Diamonds

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG759507345 or 759507345. Listed at 20 retailers as of October 29, 2026, with prices from £144 to £873, a £729 spread on the same certified stone. Reve Diamonds lists it at £873. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.20
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG759507345
Dimensions6.86 × 6.82 × 4.22 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.86 mm6.82 mm1.20 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG759507345
Side View
Table 56.0%Crown 33.2°Girdle: MED-STKPavilion 41.3°Culet: NoneDepth 61.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £353 GBP|Low: £137 GBP|High: £873 GBP|Avg: £366 GBP|-0.0%
Retailer 1
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Retailer 18
Reve Diamonds
October 30, 2026
Retailer 8£144 GBP
Retailer 6£161 GBP
Retailer 14£167 GBP
Retailer 2£178 GBP
Retailer 3£178 GBP
Retailer 16£285 GBP
Retailer 4£311 GBP
Retailer 11£323 GBP
Retailer 13£342 GBP
Retailer 1£353 GBP
Retailer 18£361 GBP
Retailer 17£362 GBP
Retailer 15£387 GBP
Retailer 10£470 GBP
Retailer 5£476 GBP
Retailer 9£573 GBP
Retailer 7£613 GBP
Retailer 12£838 GBP
Reve Diamonds£873 GBP

35 data points across 19 retailers

20 retailers£144 GBP to £873 GBP

A
Cheapest Retailer
-
£144 GBP
$193 USD
A
Retailer 2
-
£161 GBP
$216 USD
View
Final sale: no returns
A
Retailer 3
-
£167 GBP
$224 USD
View
A
Retailer 4
-
£178 GBP
$239 USD
View
A
Retailer 5
-
£178 GBP
$239 USD
View
B+
Retailer 6
-
£285 GBP
$382 USD
View
B+
Retailer 7
-
£311 GBP
$417 USD
View
B+
Retailer 8
-
£323 GBP
View
B+
Retailer 9
-
£342 GBP
€436 EUR
View
B+
Retailer 10
-
£353 GBP
View
B+
Retailer 11
-
£361 GBP
$484 USD
View
Retailer 12
-
£362 GBP
$485 USD
View
Price last confirmed 9 days ago
B+
Retailer 13
-
£387 GBP
A$798 AUD
View
B+
Retailer 14
-
£470 GBP
$630 USD
View
B
Retailer 15
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£476 GBP
$638 USD
View
Retailer 16
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£569 GBP
$762 USD
View
Price last confirmed 39 days ago
B
Retailer 17
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£573 GBP
$768 USD
View
B
Retailer 18
-
£613 GBP
$822 USD
View
B
Retailer 19
-
£838 GBP
View
Most Expensive
B
Reve Diamonds
207CC00A8 · Oct 30
£873 GBP
$1,170 USD
View
19 more retailers have this diamond
Prices start from £144 GBPSave up to £729 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.20ct Round
£144 GBP