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Heart|Lab Grown|IGI

1.00ct D SI1 Heart Lab Grown Diamond

EX • D/SI1 • IGI LG517287920

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG517287920

Diamond specifications and retailer prices

From £125 GBP
$167 USD
As of October 30, 2026
Save £520 GBP (81%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £645 GBP at MOH London · As of October 26, 2026
View at MOH London

About this 1ct lab-grown heart diamond

This 1ct lab-grown heart 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 LG517287920 or 517287920. Listed at 13 retailers as of October 26, 2026, with prices from £125 to £645, a £520 spread on the same certified stone. MOH London lists it at £645. 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

1.00
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle39.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG517287920
Dimensions6.20 × 6.81 × 3.95 mm
L/W Ratio1.10
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
6.20 mm6.81 mm1.00 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG517287920
Side View
Table 59.5%Crown 34°Girdle: STK-THKPavilion 39.8°Culet: NoneDepth 58.0%

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: Oct 30
Current: £645 GBP|Low: £111 GBP|High: £651 GBP|Avg: £321 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 5£111 GBP
Retailer 6£125 GBP
Retailer 3£187 GBP
Retailer 8£236 GBP
Retailer 2£239 GBP
Retailer 7£319 GBP
Retailer 4£468 GBP
Retailer 9£484 GBP
MOH London£645 GBP

41 data points across 9 retailers

13 retailers£125 GBP to £645 GBP

Retailer 1
-
£111 GBP
$149 USD
Price last confirmed 8 days ago
A
Retailer 2
-
£125 GBP
$167 USD
View
Final sale: no returns
A
Retailer 3
-
£129 GBP
$173 USD
View
A
Retailer 4
-
£138 GBP
$185 USD
View
A
Retailer 5
-
£138 GBP
$185 USD
View
B+
Retailer 6
-
£187 GBP
$250 USD
View
B+
Retailer 7
-
£236 GBP
$316 USD
View
B+
Retailer 8
-
£239 GBP
View
B+
Retailer 9
-
£319 GBP
$428 USD
View
B
Retailer 10
-
£443 GBP
$593 USD
View
B
Retailer 11
-
£468 GBP
$627 USD
View
B
Retailer 12
-
£484 GBP
$649 USD
View
Most Expensive
B
MOH London
LG517287920 · Oct 26
£645 GBP
View
12 more retailers have this diamond
Prices start from £125 GBPSave up to £520 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
1.00ct Heart
£125 GBP