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1.21ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG447099659

Shape and cutting style on the report: Round brilliant

Certificate IGI LG447099659

Diamond specifications and retailer prices

From $943 NZD
As of November 5, 2026
Save $7,165 NZD (88%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $8,108 NZD at MOH London · As of November 5, 2026
View at MOH London

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG447099659 or 447099659. Listed at 13 retailers as of November 5, 2026, with prices from $943 to $8,108, a $7,165 spread on the same certified stone. MOH London lists it at $8,108. 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
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG447099659
Dimensions6.94 × 6.96 × 4.14 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.94 mm6.96 mm1.21 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG447099659
Side View
Table 56.5%Crown 33.3°Girdle: THN-MEDPavilion 40.2°Culet: NoneDepth 59.5%

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 5
Current: $8,108 NZD|Low: $943 NZD|High: $8,237 NZD|Avg: $3,790 NZD|-1.3%
MOH London
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
November 6, 2026
Retailer 9$943 NZD
Retailer 8$2,453 NZD
Retailer 13$2,670 NZD
Retailer 3$2,747 NZD
Retailer 10$2,846 NZD
Retailer 12$2,846 NZD
Retailer 4$3,149 NZD
Retailer 2$3,704 NZD
Retailer 5$3,871 NZD
Retailer 11$4,494 NZD
Retailer 7$4,862 NZD
Retailer 6$5,166 NZD
Retailer 14$5,335 NZD
MOH London$8,108 NZD

44 data points across 14 retailers

13 retailers$943 NZD to $8,108 NZD

A
Cheapest Retailer
-
$943 NZD
B+
Retailer 2
-
$2,453 NZD
View
B+
Retailer 3
-
$2,670 NZD
View
B+
Retailer 4
-
$2,747 NZD
View
Final sale: no returns
B+
Retailer 5
-
$2,846 NZD
View
Retailer 6
-
$2,846 NZD
View
Price last confirmed 25 days ago
B
Retailer 7
-
$3,149 NZD
View
B+
Retailer 8
-
$3,704 NZD
View
B
Retailer 9
-
$4,494 NZD
View
Retailer 10
-
$4,862 NZD
View
Price last confirmed 8 days ago
B
Retailer 11
-
$5,166 NZD
View
B
Retailer 12
-
$5,335 NZD
View
Most Expensive
B
MOH London
LG447099659 · Nov 5
$8,108 NZD
£3,589 GBP
View
12 more retailers have this diamond
Prices start from $943 NZDSave up to $7,165 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 Round
$943 NZD