CaratHunter
Plans
Heart|Lab Grown|IGI

0.99ct E SI1 Heart Lab Grown Diamond

ID • E/SI1 • IGI LG819640684

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG819640684

Diamond specifications and retailer prices

From £186 GBP
$248 USD
As of October 28, 2026
Save £459 GBP (71%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £646 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 0.99ct lab-grown heart diamond

This 0.99ct lab-grown heart sits in the just-under-one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG819640684 or 819640684. Listed at 6 retailers as of October 28, 2026, with prices from £186 to £646, a £459 spread on the same certified stone. MOH London lists it at £646. 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

0.99
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle39.8°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG819640684
Dimensions6.35 × 6.22 × 3.97 mm
L/W Ratio1.02
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.35 mm6.22 mm0.99 ctE / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG819640684
Side View
Table 60.0%Crown 39.8°Girdle: THK-VTKPavilion 40°Culet: NoneDepth 62.5%

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: £646 GBP|Low: £176 GBP|High: £646 GBP|Avg: £320 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 29, 2026
Retailer 5£186 GBP
Retailer 4£191 GBP
Retailer 2£237 GBP
Retailer 3£261 GBP
Retailer 6£483 GBP
MOH London£646 GBP

14 data points across 6 retailers

6 retailers£186 GBP to £646 GBP

B+
Cheapest Retailer
-
£186 GBP
$248 USD
A
Retailer 2
-
£191 GBP
$254 USD
View
B+
Retailer 3
-
£237 GBP
View
B+
Retailer 4
-
£261 GBP
View
B
Retailer 5
-
£483 GBP
$644 USD
View
Most Expensive
B
MOH London
LG819640684 · Oct 29
£646 GBP
View
5 more retailers have this diamond
Prices start from £186 GBPSave up to £459 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
0.99ct Heart
£186 GBP