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Round|Lab Grown|IGI

1.20ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG759507239

Shape and cutting style on the report: Round brilliant

Certificate IGI LG759507239

Diamond specifications and retailer prices

From £145 GBP
$193 USD
As of October 29, 2026
Save £734 GBP (84%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £879 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 LG759507239 or 759507239. Listed at 19 retailers as of October 29, 2026, with prices from £145 to £879, a £734 spread on the same certified stone. Reve Diamonds lists it at £879. 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 angle34.5°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG759507239
Dimensions6.82 × 6.76 × 4.23 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
6.82 mm6.76 mm1.20 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG759507239
Side View
Table 59.0%Crown 34.5°Girdle: MediumPavilion 41.5°Culet: NoneDepth 62.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: £356 GBP|Low: £137 GBP|High: £879 GBP|Avg: £377 GBP|-0.0%
Retailer 1
Retailer 2
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Retailer 18
Reve Diamonds
October 30, 2026
Retailer 8£145 GBP
Retailer 2£162 GBP
Retailer 14£168 GBP
Retailer 3£179 GBP
Retailer 4£179 GBP
Retailer 16£287 GBP
Retailer 5£313 GBP
Retailer 11£325 GBP
Retailer 13£344 GBP
Retailer 1£356 GBP
Retailer 18£363 GBP
Retailer 17£364 GBP
Retailer 15£390 GBP
Retailer 10£473 GBP
Retailer 6£479 GBP
Retailer 9£577 GBP
Retailer 7£617 GBP
Retailer 12£843 GBP
Reve Diamonds£879 GBP

35 data points across 19 retailers

19 retailers£145 GBP to £879 GBP

A
Cheapest Retailer
-
£145 GBP
$193 USD
A
Retailer 2
-
£162 GBP
$216 USD
View
Final sale: no returns
A
Retailer 3
-
£168 GBP
$224 USD
View
A
Retailer 4
-
£179 GBP
$239 USD
View
A
Retailer 5
-
£179 GBP
$239 USD
View
B+
Retailer 6
-
£287 GBP
$382 USD
View
B+
Retailer 7
-
£313 GBP
$417 USD
View
B+
Retailer 8
-
£325 GBP
View
B+
Retailer 9
-
£344 GBP
€436 EUR
View
B+
Retailer 10
-
£356 GBP
View
B+
Retailer 11
-
£363 GBP
$484 USD
View
Retailer 12
-
£364 GBP
$485 USD
View
Price last confirmed 8 days ago
B+
Retailer 13
-
£390 GBP
A$798 AUD
View
B+
Retailer 14
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£473 GBP
$630 USD
View
B
Retailer 15
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£479 GBP
$638 USD
View
B
Retailer 16
-
£577 GBP
$768 USD
View
B
Retailer 17
-
£617 GBP
$822 USD
View
B
Retailer 18
-
£843 GBP
View
Most Expensive
B
Reve Diamonds
368F2709A · Oct 30
£879 GBP
$1,170 USD
View
18 more retailers have this diamond
Prices start from £145 GBPSave up to £734 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
£145 GBP