CaratHunter
Plans
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 $605 NZD
$341 USD
As of November 1, 2026
Save $4,771 NZD (89%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $5,376 NZD 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 31, 2026, with prices from $605 to $5,376, a $4,771 spread on the same certified stone. Do Amore Diamonds lists it at $5,376. 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

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: $5,376 NZD|Low: $605 NZD|High: $5,376 NZD|Avg: $1,731 NZD
Do Amore Diamonds
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
Retailer 17
Retailer 18
November 1, 2026
Retailer 17$605 NZD
Retailer 14$703 NZD
Retailer 12$742 NZD
Retailer 5$751 NZD
Retailer 13$751 NZD
Retailer 18$898 NZD
Retailer 6$1,020 NZD
Retailer 7$1,198 NZD
Retailer 9$1,295 NZD
Retailer 11$1,337 NZD
Retailer 15$1,343 NZD
Retailer 10$1,471 NZD
Retailer 16$2,202 NZD
Retailer 8$2,266 NZD
Retailer 4$2,663 NZD
Retailer 3$2,939 NZD
Retailer 2$3,238 NZD
Do Amore Diamonds$5,376 NZD

15 data points across 18 retailers

18 retailers$605 NZD to $5,376 NZD

A
Cheapest Retailer
-
$605 NZD
$341 USD
A
Retailer 2
-
$703 NZD
$396 USD
View
B+
Retailer 3
-
$742 NZD
$418 USD
View
A
Retailer 4
-
$751 NZD
$423 USD
View
Retailer 5
-
$751 NZD
$423 USD
View
Price last confirmed 7 days ago
A
Retailer 6
-
$898 NZD
$506 USD
View
A
Retailer 7
-
$1,020 NZD
$575 USD
View
Retailer 8
-
$1,198 NZD
$675 USD
View
Price last confirmed 11 days ago
A
Retailer 9
-
$1,295 NZD
$730 USD
View
A
Retailer 10
-
$1,337 NZD
£593 GBP
View
A
Retailer 11
-
$1,343 NZD
$757 USD
View
A
Retailer 12
-
$1,471 NZD
$829 USD
View
A
Retailer 13
-
$2,202 NZD
$1,241 USD
View
A
Retailer 14
-
$2,266 NZD
$1,277 USD
View
B+
Retailer 15
-
$2,663 NZD
$1,501 USD
View
B+
Retailer 16
-
$2,939 NZD
$1,657 USD
View
B+
Retailer 17
-
$3,238 NZD
£1,437 GBP
View
Most Expensive
B
Do Amore Diamonds
27-9CA57A5A7 · Oct 31
$5,376 NZD
$3,030 USD
View
17 more retailers have this diamond
Prices start from $605 NZDSave up to $4,771 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
$605 NZD