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Radiant|Lab Grown|IGI

1.21ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG534238077

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG534238077

Diamond specifications and retailer prices

From $352 NZD
As of November 6, 2026
Save $1,465 NZD (81%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $1,937 NZD at B2C Jewels · As of October 26, 2026
View at B2C Jewels

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG534238077 or 534238077. Listed at 18 retailers as of November 5, 2026, with a 416% 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

1.21
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.4°
Pavilion angle30.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG534238077
Dimensions7.55 × 5.24 × 3.43 mm
L/W Ratio1.44
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
7.55 mm5.24 mm1.21 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG534238077
Side View
Table 64.0%Crown 41.4°Girdle: Slightly ThickPavilion 30.1°Culet: NoneDepth 65.5%

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 6
Current: $1,937 NZD|Low: $352 NZD|High: $1,937 NZD|Avg: $952 NZD|+4.6%
B2C Jewels
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11$352 NZD
Retailer 10$390 NZD
Retailer 3$527 NZD
Retailer 2$689 NZD
Retailer 8$713 NZD
Retailer 7$722 NZD
Retailer 9$1,109 NZD
Retailer 6$1,322 NZD
Retailer 4$1,515 NZD
Retailer 5$1,817 NZD
B2C Jewels$1,937 NZD

42 data points across 11 retailers

18 retailers$352 NZD to $1,817 NZD

Retailer 1
-
$301 NZD
Price last confirmed 33 days ago
A
Retailer 2
-
$352 NZD
View
Final sale: no returns
Retailer 3
-
$384 NZD
View
Price last confirmed 43 days ago
Retailer 4
-
$390 NZD
View
Price last confirmed 35 days ago
B+
Retailer 5
-
$527 NZD
View
A
Retailer 6
-
$689 NZD
View
A
Retailer 7
-
$713 NZD
View
A
Retailer 8
-
$722 NZD
View
B+
Retailer 9
-
$989 NZD
View
Retailer 10
-
$1,109 NZD
View
Price last confirmed 31 days ago
B
Retailer 11
-
$1,129 NZD
View
B+
Retailer 12
-
$1,191 NZD
View
B
Retailer 13
-
$1,277 NZD
View
B
Retailer 14
-
$1,322 NZD
View
B
Retailer 15
-
$1,349 NZD
View
B
Retailer 16
-
$1,515 NZD
View
B
Retailer 17
-
$1,817 NZD
View
Most Expensive
B2C Jewels
20884917 · Oct 26
$1,937 NZD
$1,074 USD
View
Price last confirmed 11 days ago
17 more retailers have this diamond
Prices start from $352 NZDSave up to $1,465 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
1.21ct Radiant
$352 NZD