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Round|Lab Grown|IGI

3.68ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG652421218

Shape and cutting style on the report: Round brilliant

Certificate IGI LG652421218

Diamond specifications and retailer prices

From £308 GBP
$413 USD
As of October 26, 2026
Save £2,431 GBP (89%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,299 GBP at Jared · As of October 28, 2026
View at Jared

About this 3.68ct lab-grown round diamond

This 3.68ct lab-grown round sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG652421218 or 652421218. Listed at 12 retailers as of October 26, 2026, with a 789% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

3.68
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG652421218
Dimensions9.86 × 9.90 × 6.07 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.86 mm9.90 mm3.68 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG652421218
Side View
Table 59.0%Crown 34.7°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.5%

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 26
Current: £1,557 GBP|Low: £252 GBP|High: £2,806 GBP|Avg: £1,112 GBP|-1.9%
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
Retailer 14
October 29, 2026
Retailer 14£308 GBP
Retailer 8£345 GBP
Retailer 2£354 GBP
Retailer 9£587 GBP
Retailer 12£603 GBP
Retailer 7£605 GBP
Retailer 4£724 GBP
Retailer 5£779 GBP
Retailer 3£804 GBP
Retailer 10£1,072 GBP
Retailer 11£1,356 GBP
Retailer 1£1,557 GBP
Retailer 6£2,597 GBP
Retailer 13£2,739 GBP

34 data points across 14 retailers

12 retailers£308 GBP to £2,739 GBP

A
Cheapest Retailer
-
£308 GBP
$413 USD
A
Retailer 2
-
£345 GBP
$462 USD
View
A
Retailer 3
-
£354 GBP
$474 USD
View
Final sale: no returns
Retailer 4
-
£587 GBP
View
Price last confirmed 8 days ago
B+
Retailer 5
-
£603 GBP
$808 USD
View
A
Retailer 6
-
£605 GBP
$810 USD
View
B+
Retailer 7
-
£1,072 GBP
$1,436 USD
View
B+
Retailer 8
-
£1,356 GBP
$1,817 USD
View
B+
Retailer 9
-
£1,557 GBP
View
B
Retailer 10
-
£2,597 GBP
$3,480 USD
View
B
Retailer 11
-
£2,739 GBP
$3,670 USD
View
Most Expensive
Jared
152540144 · Oct 28
£4,299 GBP
$5,760 USD
View
Price under review
11 more retailers have this diamond
Prices start from £308 GBPSave up to £2,431 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
3.68ct Round
£308 GBP