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Round|Lab Grown|IGI

1.20ct D VS1 Round Lab Grown Diamond

ID • D/VS1 • IGI LG818644850

Shape and cutting style on the report: Round brilliant

Certificate IGI LG818644850

Diamond specifications and retailer prices

From £156 GBP
$208 USD
As of October 28, 2026
Save £706 GBP (82%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £1,602 GBP at Queensmith · As of October 27, 2026
View at Queensmith

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 VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG818644850 or 818644850. Listed at 23 retailers as of October 28, 2026, with a 452% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.20
Carat
D
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818644850
Dimensions6.79 × 6.82 × 4.22 mm
L/W Ratio1.00
Girdle conditionFaceted
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 mm6.82 mm1.20 ctD / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818644850
Side View
Table 55.0%Crown 34.2°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 62.0%

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 28
Current: £312 GBP|Low: £134 GBP|High: £818 GBP|Avg: £357 GBP|+5.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 11£140 GBP
Retailer 12£173 GBP
Retailer 3£192 GBP
Retailer 2£233 GBP
Retailer 6£293 GBP
Retailer 5£295 GBP
Retailer 7£297 GBP
Retailer 1£312 GBP
Retailer 8£422 GBP
Retailer 10£441 GBP
Retailer 4£556 GBP
Retailer 9£810 GBP

36 data points across 12 retailers

23 retailers£156 GBP to £862 GBP

A
Retailer 1
-
£140 GBP
$186 USD
Price last confirmed 11 days ago
A
Retailer 2
-
£156 GBP
$208 USD
View
Final sale: no returns
A
Retailer 3
-
£161 GBP
$215 USD
View
A
Retailer 4
-
£173 GBP
$230 USD
View
Price last confirmed 10 days ago
A
Retailer 5
-
£173 GBP
$230 USD
View
A
Retailer 6
-
£192 GBP
HK$2,000 HKD
View
B+
Retailer 7
-
£233 GBP
$310 USD
View
A
Retailer 8
-
£291 GBP
$387 USD
View
B+
Retailer 9
-
£293 GBP
€371 EUR
View
A
Retailer 10
-
£295 GBP
View
A
Retailer 11
-
£297 GBP
ZAR 6,385 ZAR
View
B+
Retailer 12
-
£312 GBP
View
B+
Retailer 13
-
£357 GBP
$476 USD
View
B+
Retailer 14
-
£422 GBP
A$864 AUD
View
B+
Retailer 15
-
£441 GBP
$587 USD
View
B
Retailer 16
-
£556 GBP
$740 USD
View
Price last confirmed 11 days ago
B
Retailer 17
-
£563 GBP
SGD 1,013 SGD
View
B
Retailer 18
-
£578 GBP
$770 USD
View
B
Retailer 19
-
£596 GBP
$794 USD
View
B
Retailer 20
-
£653 GBP
$870 USD
View
Price last confirmed 39 days ago
B
Retailer 21
-
£810 GBP
View
B
Retailer 22
-
£862 GBP
$1,148 USD
View
Most Expensive
B
Queensmith
LG818644850 · Oct 27
£1,602 GBP
View
Price under review
22 more retailers have this diamond
Prices start from £156 GBPSave up to £706 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
1.20ct Round
£156 GBP