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Round|Lab Grown|IGI

1.66ct K SI1 Round Lab Grown Diamond

EX • K/SI1 • IGI LG407948757

Shape and cutting style on the report: Round brilliant

Certificate IGI LG407948757

Diamond specifications and retailer prices

From £770 GBP
As of November 5, 2026
Save £2,258 GBP (75%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £3,029 GBP at MOH London · As of November 3, 2026
View at MOH London

About this 1.66ct lab-grown round diamond

This 1.66ct lab-grown round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG407948757 or 407948757. Listed at 9 retailers as of November 3, 2026, with prices from £770 to £3,029, a £2,258 spread on the same certified stone. MOH London lists it at £3,029. 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

1.66
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.1°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG407948757
Dimensions7.67 × 7.72 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
7.67 mm7.72 mm1.66 ctK / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG407948757
Side View
Table 59.0%Crown 32.1°GirdlePavilion 40.3°Culet: NoneDepth 59.2%

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 5
Current: £3,029 GBP|Low: £770 GBP|High: £3,069 GBP|Avg: £1,686 GBP|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 3, 2026
Retailer 3£770 GBP
Retailer 4£893 GBP
Retailer 2£1,024 GBP
Retailer 7£1,298 GBP
Retailer 5£1,424 GBP
Retailer 6£1,866 GBP
Retailer 8£2,556 GBP
MOH London£3,029 GBP

14 data points across 8 retailers

9 retailers£770 GBP to £3,029 GBP

A
Cheapest Retailer
-
£770 GBP
B+
Retailer 2
-
£838 GBP
View
Retailer 3
-
£893 GBP
View
Price last confirmed 26 days ago
B+
Retailer 4
-
£893 GBP
View
B+
Retailer 5
-
£1,024 GBP
View
B
Retailer 6
-
£1,424 GBP
View
B
Retailer 7
-
£1,674 GBP
View
B
Retailer 8
-
£1,866 GBP
View
Most Expensive
B
MOH London
LG407948757 · Nov 3
£3,029 GBP
View
8 more retailers have this diamond
Prices start from £770 GBPSave up to £2,258 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
1.66ct Round
£770 GBP