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Round|Lab Grown|IGI

1.20ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG499107349

Shape and cutting style on the report: Round brilliant

Certificate IGI LG499107349

Diamond specifications and retailer prices

From £322 GBP
$429 USD
As of October 27, 2026
Save £878 GBP (73%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,200 GBP at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.2ct lab-grown round diamond

This 1.2ct 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 LG499107349 or 499107349. Listed at 10 retailers as of October 25, 2026, with prices from £322 to £1,200, a £878 spread on the same certified stone. Reve Diamonds lists it at £1,200. 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

1.20
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG499107349
Dimensions6.79 × 6.75 × 4.23 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
6.79 mm6.75 mm1.20 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG499107349
Side View
Table 56.0%Crown 34.9°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 62.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 27
Current: £540 GBP|Low: £195 GBP|High: £1,235 GBP|Avg: £538 GBP|+4.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Reve Diamonds
October 27, 2026
Retailer 3£246 GBP
Retailer 12£274 GBP
Retailer 2£300 GBP
Retailer 9£304 GBP
Retailer 4£322 GBP
Retailer 8£409 GBP
Retailer 11£421 GBP
Retailer 7£424 GBP
Retailer 10£488 GBP
Retailer 1£540 GBP
Retailer 6£893 GBP
Reve Diamonds£1,200 GBP
Retailer 5£1,222 GBP

26 data points across 13 retailers

10 retailers£322 GBP to £1,200 GBP

B+
Cheapest Retailer
-
£322 GBP
$429 USD
B+
Retailer 2
-
£409 GBP
$545 USD
View
B+
Retailer 3
-
£421 GBP
$560 USD
View
Retailer 4
-
£424 GBP
$565 USD
View
Price last confirmed 12 days ago
B
Retailer 5
-
£488 GBP
$650 USD
View
B
Retailer 6
-
£540 GBP
View
B
Retailer 7
-
£893 GBP
$1,189 USD
View
Retailer 8
-
£978 GBP
$1,303 USD
View
Price last confirmed 33 days ago
B
Retailer 9
-
£1,012 GBP
$1,348 USD
View
Most Expensive
B
Reve Diamonds
CC94F2FBE · Oct 25
£1,200 GBP
$1,599 USD
View
9 more retailers have this diamond
Prices start from £322 GBPSave up to £878 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.

B+
1.20ct Round
£322 GBP