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Round|Lab Grown|IGI

1.58ct H SI1 Round Lab Grown Diamond

EX • H/SI1 • IGI LG12378004

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12378004

Diamond specifications and retailer prices

From £254 GBP
$341 USD
As of October 29, 2026
Save £2,007 GBP (89%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £2,261 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 1.58ct lab-grown round diamond

This 1.58ct lab-grown round sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG12378004 or 12378004. Listed at 18 retailers as of October 29, 2026, with prices from £254 to £2,261, a £2,007 spread on the same certified stone. Do Amore Diamonds lists it at £2,261. 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

1.58
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12378004
Dimensions7.42 × 7.47 × 4.64 mm
L/W Ratio1.01
Cert comments
As Grown - No indications of post-growth treatment. This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process.
Top View
7.42 mm7.47 mm1.58 ctH / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12378004
Side View
Table 59.0%Crown 35.5°Girdle: MED-UNDPavilion 41.4°Culet: NoneDepth 62.2%

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 29
Current: £2,261 GBP|Low: £254 GBP|High: £2,261 GBP|Avg: £729 GBP
Do Amore Diamonds
Retailer 2
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Retailer 18
October 30, 2026
Retailer 17£254 GBP
Retailer 14£296 GBP
Retailer 2£312 GBP
Retailer 5£316 GBP
Retailer 13£316 GBP
Retailer 18£378 GBP
Retailer 6£429 GBP
Retailer 7£504 GBP
Retailer 9£545 GBP
Retailer 11£564 GBP
Retailer 15£565 GBP
Retailer 10£619 GBP
Retailer 16£926 GBP
Retailer 8£953 GBP
Retailer 4£1,120 GBP
Retailer 3£1,236 GBP
Retailer 12£1,369 GBP
Do Amore Diamonds£2,261 GBP

14 data points across 18 retailers

18 retailers£254 GBP to £2,261 GBP

A
Cheapest Retailer
-
£254 GBP
$341 USD
A
Retailer 2
-
£296 GBP
$396 USD
View
B+
Retailer 3
-
£312 GBP
$418 USD
View
A
Retailer 4
-
£316 GBP
$423 USD
View
A
Retailer 5
-
£316 GBP
$423 USD
View
A
Retailer 6
-
£378 GBP
$506 USD
View
A
Retailer 7
-
£429 GBP
$575 USD
View
Retailer 8
-
£504 GBP
$675 USD
View
Price last confirmed 10 days ago
A
Retailer 9
-
£545 GBP
$730 USD
View
A
Retailer 10
-
£564 GBP
View
A
Retailer 11
-
£565 GBP
$757 USD
View
A
Retailer 12
-
£619 GBP
$829 USD
View
A
Retailer 13
-
£926 GBP
$1,241 USD
View
A
Retailer 14
-
£953 GBP
$1,277 USD
View
B+
Retailer 15
-
£1,120 GBP
$1,501 USD
View
B+
Retailer 16
-
£1,236 GBP
$1,657 USD
View
B+
Retailer 17
-
£1,369 GBP
View
Most Expensive
B
Do Amore Diamonds
27-9CA57A5A7 · Oct 31
£2,261 GBP
$3,030 USD
View
17 more retailers have this diamond
Prices start from £254 GBPSave up to £2,007 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
1.58ct Round
£254 GBP