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Round|Lab Grown|IGI

1.23ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG759507271

Shape and cutting style on the report: Round brilliant

Certificate IGI LG759507271

Diamond specifications and retailer prices

From £146 GBP
As of November 5, 2026
Save £733 GBP (83%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £879 GBP at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

About this 1.23ct lab-grown round diamond

This 1.23ct 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 LG759507271 or 759507271. Listed at 21 retailers as of November 5, 2026, with prices from £146 to £879, a £733 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

1.23
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG759507271
Dimensions6.91 × 6.88 × 4.21 mm
L/W Ratio1.00
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
6.91 mm6.88 mm1.23 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG759507271
Side View
Table 60.0%Crown 33.7°Girdle: MediumPavilion 41.4°Culet: NoneDepth 61.0%

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: Nov 5
Current: £356 GBP|Low: £145 GBP|High: £879 GBP|Avg: £397 GBP|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Reve Diamonds
November 6, 2026
Retailer 7£146 GBP
Retailer 5£163 GBP
Retailer 15£169 GBP
Retailer 2£181 GBP
Retailer 3£181 GBP
Retailer 4£315 GBP
Retailer 10£325 GBP
Retailer 9£344 GBP
Retailer 1£356 GBP
Retailer 16£364 GBP
Retailer 14£390 GBP
Retailer 11£483 GBP
Retailer 8£583 GBP
Retailer 13£585 GBP
Retailer 6£623 GBP
Retailer 12£845 GBP
Reve Diamonds£879 GBP

33 data points across 17 retailers

21 retailers£146 GBP to £879 GBP

A
Cheapest Retailer
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£146 GBP
A
Retailer 2
-
£163 GBP
View
Final sale: no returns
A
Retailer 3
-
£169 GBP
View
Retailer 4
-
£181 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£181 GBP
View
B+
Retailer 6
-
£296 GBP
View
B+
Retailer 7
-
£315 GBP
View
B+
Retailer 8
-
£325 GBP
View
B+
Retailer 9
-
£344 GBP
View
B+
Retailer 10
-
£356 GBP
View
B+
Retailer 11
-
£364 GBP
View
B+
Retailer 12
-
£364 GBP
View
B+
Retailer 13
-
£390 GBP
View
B
Retailer 14
-
£483 GBP
View
B
Retailer 15
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£496 GBP
View
Retailer 16
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£578 GBP
View
Price last confirmed 46 days ago
B
Retailer 17
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£583 GBP
View
B
Retailer 18
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£585 GBP
View
B
Retailer 19
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£623 GBP
View
B
Retailer 20
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£845 GBP
View
Most Expensive
B
Reve Diamonds
932605E8E · Nov 6
£879 GBP
$1,183 USD
View
20 more retailers have this diamond
Prices start from £146 GBPSave up to £733 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
1.23ct Round
£146 GBP