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Round|Lab Grown|IGI

1.00ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG678536151

Shape and cutting style on the report: Round brilliant

Certificate IGI LG678536151

Diamond specifications and retailer prices

From £106 GBP
$142 USD
As of October 29, 2026
Save £648 GBP (86%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £754 GBP at Reve Diamonds · As of October 30, 2026
View at Reve Diamonds

About this 1ct lab-grown round diamond

This 1ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG678536151 or 678536151. Listed at 22 retailers as of October 29, 2026, with prices from £106 to £754, a £648 spread on the same certified stone. Reve Diamonds lists it at £754. 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
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG678536151
Dimensions6.38 × 6.43 × 3.94 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
6.38 mm6.43 mm1.00 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG678536151
Side View
Table 57.0%Crown 35.3°Girdle: MediumPavilion 40.5°Culet: NoneDepth 61.5%

Caratlytics Score

How it works →
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 29
Current: £226 GBP|Low: £84 GBP|High: £754 GBP|Avg: £308 GBP|+7.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Reve Diamonds
October 30, 2026
Retailer 5£106 GBP
Retailer 8£118 GBP
Retailer 10£123 GBP
Retailer 2£132 GBP
Retailer 15£132 GBP
Retailer 13£201 GBP
Retailer 1£226 GBP
Retailer 16£245 GBP
Retailer 9£259 GBP
Retailer 14£314 GBP
Retailer 7£343 GBP
Retailer 3£352 GBP
Retailer 12£358 GBP
Retailer 6£424 GBP
Retailer 4£465 GBP
Retailer 11£620 GBP
Reve Diamonds£754 GBP

42 data points across 17 retailers

22 retailers£106 GBP to £754 GBP

Retailer 1
-
£105 GBP
$141 USD
Price last confirmed 38 days ago
A
Retailer 2
-
£106 GBP
$142 USD
View
A
Retailer 3
-
£118 GBP
$158 USD
View
Final sale: no returns
A
Retailer 4
-
£123 GBP
$165 USD
View
Retailer 5
-
£129 GBP
$173 USD
View
Price last confirmed 38 days ago
A
Retailer 6
-
£132 GBP
$177 USD
View
A
Retailer 7
-
£132 GBP
$177 USD
View
A
Retailer 8
-
£201 GBP
$269 USD
View
A
Retailer 9
-
£226 GBP
View
B+
Retailer 10
-
£245 GBP
$328 USD
View
B+
Retailer 11
-
£259 GBP
€331 EUR
View
Retailer 12
-
£302 GBP
$405 USD
View
Price last confirmed 88 days ago
B+
Retailer 13
-
£314 GBP
$421 USD
View
B
Retailer 14
-
£343 GBP
$460 USD
View
B+
Retailer 15
-
£352 GBP
$472 USD
View
B+
Retailer 16
-
£358 GBP
A$738 AUD
View
Retailer 17
-
£402 GBP
$538 USD
View
Price last confirmed 38 days ago
Retailer 18
-
£420 GBP
$563 USD
View
Price last confirmed 39 days ago
B
Retailer 19
-
£424 GBP
$568 USD
View
B
Retailer 20
-
£465 GBP
$623 USD
View
Retailer 21
-
£620 GBP
View
Price last confirmed 11 days ago
Most Expensive
B
Reve Diamonds
79CED0231 · Oct 30
£754 GBP
$1,010 USD
View
21 more retailers have this diamond
Prices start from £106 GBPSave up to £648 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 Round
£106 GBP