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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 $733 NZD
$413 USD
As of November 1, 2026
Save $2,544 NZD (78%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $5,447 NZD at Do Amore Diamonds · As of November 2, 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $5,447 NZD|Low: $513 NZD|High: $5,447 NZD|Avg: $1,943 NZD|+37.1%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 9$513 NZD
Retailer 5$733 NZD
Retailer 6$1,221 NZD
Retailer 8$1,501 NZD
Retailer 2$1,513 NZD
Retailer 4$2,227 NZD
Retailer 10$2,354 NZD
Retailer 7$2,970 NZD
Retailer 3$3,276 NZD
Do Amore Diamonds$5,447 NZD

30 data points across 10 retailers

14 retailers$733 NZD to $3,276 NZD

Retailer 1
-
$413 NZD
$233 USD
Price last confirmed 41 days ago
Retailer 2
-
$479 NZD
$270 USD
View
Price last confirmed 41 days ago
Retailer 3
-
$506 NZD
$285 USD
View
Price last confirmed 41 days ago
A
Retailer 4
-
$733 NZD
$413 USD
View
B+
Retailer 5
-
$1,029 NZD
$580 USD
View
B
Retailer 6
-
$1,221 NZD
$688 USD
View
B
Retailer 7
-
$1,501 NZD
$846 USD
View
B
Retailer 8
-
$1,513 NZD
£671 GBP
View
Retailer 9
-
$1,817 NZD
$1,024 USD
View
Price last confirmed 42 days ago
B
Retailer 10
-
$2,227 NZD
$1,255 USD
View
B
Retailer 11
-
$2,354 NZD
$1,327 USD
View
B
Retailer 12
-
$2,970 NZD
$1,674 USD
View
C
Retailer 13
-
$3,276 NZD
£1,454 GBP
View
Most Expensive
Do Amore Diamonds
27-42F31B056 · Nov 2
$5,447 NZD
$3,070 USD
View
Price under review
13 more retailers have this diamond
Prices start from $733 NZDSave up to $2,544 NZD

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
$733 NZD