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Cushion|Lab Grown|IGI

1.77ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG731533573

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG731533573

Diamond specifications and retailer prices

From £319 GBP
$428 USD
As of October 30, 2026
Save £2,479 GBP (89%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £2,799 GBP at Brilliant Earth · As of October 24, 2026
View at Brilliant Earth

About this 1.77ct lab-grown cushion diamond

This 1.77ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG731533573 or 731533573. Listed at 22 retailers as of October 24, 2026, with prices from £319 to £2,799, a £2,479 spread on the same certified stone. Brilliant Earth lists it at £2,799. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.77
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle29.8°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731533573
Dimensions8.25 × 6.61 × 4.38 mm
L/W Ratio1.25
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
8.25 mm6.61 mm1.77 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731533573
Side View
Table 60.0%Crown 29.8°Girdle: MED-STKPavilion 39.6°Culet: NoneDepth 66.3%

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 30
Current: £2,478 GBP|Low: £319 GBP|High: £2,888 GBP|Avg: £1,132 GBP|-11.5%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
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Retailer 11
Retailer 12
Retailer 13
Retailer 14
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Retailer 16
Retailer 17
Retailer 18
Retailer 19
October 30, 2026
Retailer 6£319 GBP
Retailer 12£416 GBP
Retailer 5£487 GBP
Retailer 17£537 GBP
Retailer 18£546 GBP
Retailer 2£565 GBP
Retailer 13£646 GBP
Retailer 16£674 GBP
Retailer 15£715 GBP
Retailer 4£801 GBP
Retailer 14£913 GBP
Retailer 10£1,149 GBP
Retailer 11£1,285 GBP
Retailer 7£1,322 GBP
Retailer 3£1,329 GBP
Retailer 9£1,447 GBP
Retailer 8£2,146 GBP
Brilliant Earth£2,478 GBP
Retailer 19£2,545 GBP

28 data points across 19 retailers

22 retailers£319 GBP to £2,799 GBP

A
Cheapest Retailer
-
£319 GBP
$428 USD
Final sale: no returns
A
Retailer 2
-
£416 GBP
View
A
Retailer 3
-
£487 GBP
HK$5,100 HKD
View
A
Retailer 4
-
£537 GBP
$720 USD
View
A
Retailer 5
-
£546 GBP
$731 USD
View
A
Retailer 6
-
£565 GBP
$757 USD
View
A
Retailer 7
-
£646 GBP
View
A
Retailer 8
-
£674 GBP
ZAR 14,581 ZAR
View
A
Retailer 9
-
£715 GBP
€912 EUR
View
A
Retailer 10
-
£801 GBP
$1,073 USD
View
A
Retailer 11
-
£913 GBP
A$1,882 AUD
View
Retailer 12
-
£1,149 GBP
View
Price last confirmed 9 days ago
B+
Retailer 13
-
£1,285 GBP
$1,722 USD
View
B+
Retailer 14
-
£1,322 GBP
$1,772 USD
View
B+
Retailer 15
-
£1,329 GBP
$1,781 USD
View
Retailer 16
-
£1,447 GBP
View
Price last confirmed 10 days ago
Retailer 17
-
£2,049 GBP
$2,745 USD
View
Price last confirmed 26 days ago
Retailer 18
-
£2,146 GBP
$2,875 USD
View
Price last confirmed 9 days ago
B
Retailer 19
-
£2,389 GBP
View
B
Retailer 20
-
£2,478 GBP
$3,320 USD
View
B
Retailer 21
-
£2,545 GBP
$3,410 USD
View
Most Expensive
B
Brilliant Earth
15616671A · Oct 24
£2,799 GBP
$3,750 USD
View
21 more retailers have this diamond
Prices start from £319 GBPSave up to £2,479 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
1.77ct Cushion
£319 GBP