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Cushion|Lab Grown|IGI

0.51ct E IF Cushion Lab Grown Diamond

VG • E/IF • IGI LG816658270

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG816658270

Diamond specifications and retailer prices

From £183 GBP
$244 USD
As of October 30, 2026
Save £756 GBP (80%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £939 GBP at Reve Diamonds · As of October 30, 2026
View at Reve Diamonds

About this 0.51ct lab-grown cushion diamond

This 0.51ct lab-grown cushion sits in the half to three-quarter carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG816658270 or 816658270. Listed at 14 retailers as of October 30, 2026, with prices from £183 to £939, a £756 spread on the same certified stone. Reve Diamonds lists it at £939. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
E
Colour
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle33.8°
Pavilion angle36.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816658270
Dimensions5.09 × 4.22 × 2.86 mm
L/W Ratio1.21
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
5.09 mm4.22 mm0.51 ctE / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG816658270
Side View
Table 62.0%Crown 33.8°Girdle: MED-THKPavilion 36.8°Culet: NoneDepth 67.8%

Caratlytics Score

How it works →
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: £436 GBP|Low: £183 GBP|High: £1,126 GBP|Avg: £576 GBP|+1.8%
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
Reve Diamonds
October 29, 2026
Retailer 2£183 GBP
Retailer 10£207 GBP
Retailer 5£276 GBP
Retailer 3£293 GBP
Retailer 9£405 GBP
Retailer 4£421 GBP
Retailer 1£436 GBP
Retailer 12£472 GBP
Retailer 13£649 GBP
Retailer 11£849 GBP
Retailer 6£901 GBP
Retailer 8£901 GBP
Retailer 7£902 GBP
Reve Diamonds£939 GBP

23 data points across 14 retailers

14 retailers£183 GBP to £939 GBP

A
Cheapest Retailer
-
£183 GBP
$244 USD
Final sale: no returns
A
Retailer 2
-
£207 GBP
$275 USD
View
A
Retailer 3
-
£276 GBP
$368 USD
View
A
Retailer 4
-
£293 GBP
$390 USD
View
B+
Retailer 5
-
£405 GBP
ZAR 8,716 ZAR
View
B+
Retailer 6
-
£421 GBP
$560 USD
View
B+
Retailer 7
-
£436 GBP
€553 EUR
View
B+
Retailer 8
-
£472 GBP
$628 USD
View
B
Retailer 9
-
£649 GBP
CA$1,200 CAD
View
B
Retailer 10
-
£849 GBP
$1,130 USD
View
B
Retailer 11
-
£901 GBP
$1,200 USD
View
B
Retailer 12
-
£901 GBP
$1,200 USD
View
B
Retailer 13
-
£902 GBP
View
Most Expensive
B
Reve Diamonds
CCEBE8890 · Oct 30
£939 GBP
$1,250 USD
View
13 more retailers have this diamond
Prices start from £183 GBPSave up to £756 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
0.51ct Cushion
£183 GBP