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Round|Lab Grown|IGI

1.00ct D SI2 Round Lab Grown Diamond

VG • D/SI2 • IGI LG472171921

Shape and cutting style on the report: Round brilliant

Certificate IGI LG472171921

Diamond specifications and retailer prices

From £520 GBP
$692 USD
As of October 29, 2026
Save £461 GBP (47%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,695 GBP at NZ Jewellers · As of October 27, 2026
View at NZ Jewellers

About this 1ct lab-grown round diamond

This 1ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI LG472171921 or 472171921. Listed at 11 retailers as of October 28, 2026, with a 89% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.00
Carat
D
Colour
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle37.3°
Pavilion angle39.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG472171921
Dimensions6.22 × 6.24 × 4.00 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
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
6.22 mm6.24 mm1.00 ctD / SI2
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG472171921
Side View
Table 53.5%Crown 37.3°Girdle: STK-THKPavilion 39.9°Culet: NoneDepth 64.2%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £959 GBP|Low: £415 GBP|High: £2,396 GBP|Avg: £883 GBP|+4.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 29, 2026
Retailer 4£520 GBP
Retailer 9£565 GBP
Retailer 8£581 GBP
Retailer 5£586 GBP
Retailer 6£603 GBP
Retailer 1£959 GBP
Retailer 7£981 GBP
Retailer 3£1,485 GBP
Retailer 2£2,379 GBP

39 data points across 9 retailers

11 retailers£520 GBP to £981 GBP

B
Cheapest Retailer
-
£520 GBP
$692 USD
B
Retailer 2
-
£565 GBP
$753 USD
View
B
Retailer 3
-
£581 GBP
$774 USD
View
Final sale: no returns
B
Retailer 4
-
£586 GBP
$780 USD
View
B
Retailer 5
-
£603 GBP
$803 USD
View
B
Retailer 6
-
£603 GBP
$803 USD
View
Price last confirmed 13 days ago
B
Retailer 7
-
£959 GBP
View
B
Retailer 8
-
£981 GBP
$1,306 USD
View
C
Retailer 9
-
£1,485 GBP
$1,977 USD
View
Price under review
Most Expensive
C
NZ Jewellers
f13a41f1-9cd8-4987-9080-721df8d72f0b · Oct 27
£1,695 GBP
$2,257 USD
View
Price under review
9 more retailers have this diamond
Prices start from £520 GBPSave up to £461 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
1.00ct Round
£520 GBP