Cushion|Lab Grown|IGI

1.51ct G IF Cushion Lab Grown Diamond

ID • G/IF • IGI LG816616233

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG816616233

Diamond specifications and retailer prices

From £395 GBP
As of November 1, 2026
Save £1,223 GBP (76%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,619 GBP at Helzberg Diamonds · As of October 31, 2026
View at Helzberg Diamonds

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816616233 or 816616233. Listed at 17 retailers as of October 31, 2026, with prices from £395 to £1,619, a £1,223 spread on the same certified stone. Helzberg Diamonds lists it at £1,619. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
G
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle36.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816616233
Dimensions8.56 × 5.85 × 3.86 mm
L/W Ratio1.46
Girdle conditionFaceted
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
8.56 mm5.85 mm1.51 ctG / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816616233
Side View
Table 59.0%Crown 35.4°Girdle: MED-THKPavilion 36.4°Culet: NoneDepth 66.0%

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 1
Current: £1,619 GBP|Low: £374 GBP|High: £1,619 GBP|Avg: £944 GBP
Helzberg Diamonds
Retailer 2
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Retailer 9
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Retailer 11
Retailer 12
Retailer 13
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Retailer 17
November 1, 2026
Retailer 8£374 GBP
Retailer 2£395 GBP
Retailer 3£567 GBP
Retailer 4£592 GBP
Retailer 11£597 GBP
Retailer 10£615 GBP
Retailer 15£643 GBP
Retailer 5£714 GBP
Retailer 13£871 GBP
Retailer 16£902 GBP
Retailer 6£1,189 GBP
Retailer 7£1,229 GBP
Retailer 17£1,250 GBP
Retailer 12£1,301 GBP
Retailer 14£1,469 GBP
Retailer 9£1,582 GBP
Helzberg Diamonds£1,619 GBP

32 data points across 17 retailers

17 retailers£395 GBP to £1,619 GBP

Retailer 1
-
£374 GBP
$501 USD
Price last confirmed 7 days ago
A
Retailer 2
-
£395 GBP
View
A
Retailer 3
-
£567 GBP
$760 USD
View
A
Retailer 4
-
£592 GBP
$793 USD
View
A
Retailer 5
-
£597 GBP
€762 EUR
View
A
Retailer 6
-
£615 GBP
View
A
Retailer 7
-
£643 GBP
ZAR 13,911 ZAR
View
A
Retailer 8
-
£714 GBP
$957 USD
View
A
Retailer 9
-
£871 GBP
A$1,795 AUD
View
A
Retailer 10
-
£902 GBP
$1,208 USD
View
B+
Retailer 11
-
£1,189 GBP
SGD 2,153 SGD
View
B+
Retailer 12
-
£1,229 GBP
$1,646 USD
View
Retailer 13
-
£1,250 GBP
$1,675 USD
View
Price last confirmed 13 days ago
B+
Retailer 14
-
£1,301 GBP
$1,743 USD
View
B+
Retailer 15
-
£1,469 GBP
View
B+
Retailer 16
-
£1,582 GBP
$2,120 USD
View
Most Expensive
B+
Helzberg Diamonds
ZXZOHMMHMIJJ · Oct 31
£1,619 GBP
$2,169 USD
View
16 more retailers have this diamond
Prices start from £395 GBPSave up to £1,223 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
1.51ct Cushion
£395 GBP