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Round|Lab Grown|IGI

1.58ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG12255716

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12255716

Diamond specifications and retailer prices

From £308 GBP
$413 USD
As of November 1, 2026
Save £1,070 GBP (78%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £2,291 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG12255716 or 12255716. Listed at 14 retailers as of November 1, 2026, with a 347% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12255716
Dimensions7.57 × 7.53 × 4.53 mm
L/W Ratio1.01
Culet sizePointed
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
7.57 mm7.53 mm1.58 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12255716
Side View
Table 60.5%Crown 34°Girdle: MED-UNDPavilion 40.9°Culet: NoneDepth 60.0%

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: Nov 1
Current: £2,291 GBP|Low: £216 GBP|High: £2,291 GBP|Avg: £814 GBP|+37.1%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 9£216 GBP
Retailer 5£308 GBP
Retailer 6£513 GBP
Retailer 3£631 GBP
Retailer 8£631 GBP
Retailer 4£937 GBP
Retailer 10£990 GBP
Retailer 7£1,249 GBP
Retailer 2£1,378 GBP
Do Amore Diamonds£2,291 GBP

29 data points across 10 retailers

14 retailers£308 GBP to £1,378 GBP

Retailer 1
-
£174 GBP
$233 USD
Price last confirmed 40 days ago
Retailer 2
-
£202 GBP
$270 USD
View
Price last confirmed 40 days ago
Retailer 3
-
£213 GBP
$285 USD
View
Price last confirmed 41 days ago
A
Retailer 4
-
£308 GBP
$413 USD
View
B+
Retailer 5
-
£433 GBP
$580 USD
View
B
Retailer 6
-
£513 GBP
$688 USD
View
B
Retailer 7
-
£631 GBP
View
B
Retailer 8
-
£631 GBP
$846 USD
View
Retailer 9
-
£764 GBP
$1,024 USD
View
Price last confirmed 42 days ago
B
Retailer 10
-
£937 GBP
$1,255 USD
View
B
Retailer 11
-
£990 GBP
$1,327 USD
View
B
Retailer 12
-
£1,249 GBP
$1,674 USD
View
C
Retailer 13
-
£1,378 GBP
View
Most Expensive
Do Amore Diamonds
27-42F31B056 · Oct 31
£2,291 GBP
$3,070 USD
View
Price under review
13 more retailers have this diamond
Prices start from £308 GBPSave up to £1,070 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
£308 GBP