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Princess|Lab Grown|IGI

1.21ct D SI1 Princess Lab Grown Diamond

EX • D/SI1 • IGI LG726537000

Shape and cutting style on the report: Princess cut

Certificate IGI LG726537000

Diamond specifications and retailer prices

From £144 GBP
As of November 6, 2026
Save £729 GBP (83%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £873 GBP at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

About this 1.21ct lab-grown princess diamond

This 1.21ct lab-grown princess 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 LG726537000 or 726537000. Listed at 19 retailers as of November 6, 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

1.21
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46.5°
Pavilion angle39.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG726537000
Dimensions5.76 × 5.74 × 4.25 mm
L/W Ratio1.00
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
5.76 mm5.74 mm1.21 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG726537000
Side View
Table 69.0%Crown 46.5°Girdle: MediumPavilion 39.8°Culet: NoneDepth 74.0%

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 6
Current: £322 GBP|Low: £143 GBP|High: £899 GBP|Avg: £427 GBP|+4.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
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Retailer 7
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Retailer 11
Retailer 12
Retailer 13
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Retailer 16
Reve Diamonds
November 6, 2026
Retailer 4£144 GBP
Retailer 5£161 GBP
Retailer 13£167 GBP
Retailer 7£179 GBP
Retailer 16£179 GBP
Retailer 2£311 GBP
Retailer 1£322 GBP
Retailer 8£332 GBP
Retailer 12£341 GBP
Retailer 15£361 GBP
Retailer 14£472 GBP
Retailer 3£575 GBP
Retailer 9£577 GBP
Retailer 11£587 GBP
Retailer 6£614 GBP
Retailer 10£836 GBP
Reve Diamonds£873 GBP

45 data points across 17 retailers

19 retailers£144 GBP to £873 GBP

A
Cheapest Retailer
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£144 GBP
A
Retailer 2
-
£161 GBP
View
Final sale: no returns
A
Retailer 3
-
£167 GBP
View
Retailer 4
-
£175 GBP
View
Price last confirmed 45 days ago
A
Retailer 5
-
£179 GBP
View
Retailer 6
-
£179 GBP
View
Price last confirmed 12 days ago
B+
Retailer 7
-
£311 GBP
View
B+
Retailer 8
-
£322 GBP
View
B+
Retailer 9
-
£332 GBP
View
Retailer 10
-
£341 GBP
View
Price last confirmed 8 days ago
B+
Retailer 11
-
£361 GBP
View
Retailer 12
-
£472 GBP
View
Price last confirmed 9 days ago
B
Retailer 13
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£487 GBP
View
B
Retailer 14
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£575 GBP
View
B
Retailer 15
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£577 GBP
View
B
Retailer 16
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£587 GBP
View
B
Retailer 17
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£614 GBP
View
B
Retailer 18
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£836 GBP
View
Most Expensive
B
Reve Diamonds
A3692AA53 · Nov 6
£873 GBP
$1,175 USD
View
18 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
1.21ct Princess
£144 GBP