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Round|Lab Grown|IGI

1.09ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG698516538

Shape and cutting style on the report: Round brilliant

Certificate IGI LG698516538

Diamond specifications and retailer prices

From £102 GBP
$137 USD
As of October 29, 2026
Save £306 GBP (75%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £653 GBP at Rare Carat · As of August 9, 2026
View at Rare Carat

About this 1.09ct lab-grown round diamond

This 1.09ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG698516538 or 698516538. Listed at 12 retailers as of October 27, 2026, with a 299% 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

1.09
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG698516538
Dimensions6.58 × 6.63 × 4.07 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.58 mm6.63 mm1.09 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG698516538
Side View
Table 55.0%Crown 34.8°Girdle: MediumPavilion 40.6°Culet: NoneDepth 61.7%

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 29
Current: £653 GBP|Low: £102 GBP|High: £1,237 GBP|Avg: £403 GBP
Rare Carat
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 30, 2026
Retailer 9£102 GBP
Retailer 2£119 GBP
Retailer 4£127 GBP
Retailer 14£143 GBP
Retailer 8£215 GBP
Retailer 10£226 GBP
Retailer 12£231 GBP
Retailer 13£238 GBP
Retailer 7£252 GBP
Retailer 11£313 GBP
Retailer 3£408 GBP
Retailer 5£586 GBP
Rare Carat£653 GBP
Retailer 6£784 GBP

5 data points across 14 retailers

12 retailers£102 GBP to £408 GBP

A
Cheapest Retailer
-
£102 GBP
$137 USD
A
Retailer 2
-
£119 GBP
$159 USD
View
A
Retailer 3
-
£127 GBP
$170 USD
View
A
Retailer 4
-
£143 GBP
HK$1,500 HKD
View
A
Retailer 5
-
£215 GBP
View
A
Retailer 6
-
£226 GBP
€289 EUR
View
A
Retailer 7
-
£231 GBP
$309 USD
View
B+
Retailer 8
-
£238 GBP
$319 USD
View
A
Retailer 9
-
£252 GBP
View
B+
Retailer 10
-
£313 GBP
$419 USD
View
B+
Retailer 11
-
£408 GBP
$547 USD
View
Most Expensive
Rare Carat
1271316 · Aug 9
£653 GBP
$875 USD
View
Price last confirmed 81 days ago
11 more retailers have this diamond
Prices start from £102 GBPSave up to £306 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
1.09ct Round
£102 GBP