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Round|Lab Grown|IGI

5.51ct D FL Round Lab Grown Diamond

ID • D/FL • IGI LG768629057

Shape and cutting style on the report: Round brilliant

Certificate IGI LG768629057

Diamond specifications and retailer prices

From £5,728 GBP
$7,675 USD
As of October 30, 2026
Save £17,108 GBP (75%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £22,836 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 5.51ct lab-grown round diamond

This 5.51ct lab-grown round sits in the over five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG768629057 or 768629057. Listed at 14 retailers as of October 30, 2026, with prices from £5,728 to £22,836, a £17,108 spread on the same certified stone. Taylor and Hart lists it at £22,836. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

5.51
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG768629057
Dimensions11.36 × 11.42 × 6.95 mm
L/W Ratio1.01
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
11.36 mm11.42 mm5.51 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG768629057
Side View
Table 56.0%Crown 34.5°Girdle: THN-MEDPavilion 40.7°Culet: NoneDepth 61.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £8,498 GBP|Low: £5,728 GBP|High: £27,249 GBP|Avg: £12,898 GBP|+0.4%
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
Taylor and Hart
November 1, 2026
Retailer 12£5,728 GBP
Retailer 3£6,559 GBP
Retailer 2£7,405 GBP
Retailer 13£7,748 GBP
Retailer 1£8,498 GBP
Retailer 11£11,735 GBP
Retailer 6£11,830 GBP
Retailer 5£12,287 GBP
Retailer 9£13,217 GBP
Retailer 8£14,388 GBP
Retailer 7£17,121 GBP
Retailer 4£19,451 GBP
Retailer 10£21,380 GBP
Taylor and Hart£22,836 GBP

42 data points across 14 retailers

14 retailers£5,728 GBP to £22,836 GBP

A
Cheapest Retailer
-
£5,728 GBP
$7,675 USD
A
Retailer 2
-
£6,559 GBP
$8,789 USD
View
Retailer 3
-
£6,791 GBP
$9,099 USD
View
Price last confirmed 76 days ago
A
Retailer 4
-
£7,405 GBP
$9,922 USD
View
A
Retailer 5
-
£7,748 GBP
HK$81,100 HKD
View
A
Retailer 6
-
£8,498 GBP
View
A
Retailer 7
-
£11,735 GBP
$15,723 USD
View
A
Retailer 8
-
£11,830 GBP
€15,096 EUR
View
B+
Retailer 9
-
£13,217 GBP
View
B+
Retailer 10
-
£14,388 GBP
ZAR 311,441 ZAR
View
B+
Retailer 11
-
£17,121 GBP
$22,940 USD
View
B+
Retailer 12
-
£19,451 GBP
$26,062 USD
View
B
Retailer 13
-
£21,380 GBP
$28,647 USD
View
Most Expensive
B
Taylor and Hart
BCB6Q9W · Oct 31
£22,836 GBP
$30,598 USD
View
13 more retailers have this diamond
Prices start from £5,728 GBPSave up to £17,108 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
5.51ct Round
£5,728 GBP