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1.21ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG425066489

Shape and cutting style on the report: Round brilliant

Certificate IGI LG425066489

Diamond specifications and retailer prices

From $1,085 NZD
As of November 5, 2026
Save $7,043 NZD (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $8,129 NZD at MOH London · As of November 3, 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 LG425066489 or 425066489. Listed at 13 retailers as of November 3, 2026, with prices from $1,085 to $8,129, a $7,043 spread on the same certified stone. MOH London lists it at $8,129. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.6°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG425066489
Dimensions6.96 × 6.98 × 4.13 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.96 mm6.98 mm1.21 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG425066489
Side View
Table 58.5%Crown 31.6°GirdlePavilion 40.9°Culet: NoneDepth 59.3%

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: $8,129 NZD|Low: $1,085 NZD|High: $8,237 NZD|Avg: $3,733 NZD|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 6$1,085 NZD
Retailer 5$2,453 NZD
Retailer 11$2,670 NZD
Retailer 10$2,748 NZD
Retailer 7$2,846 NZD
Retailer 9$2,846 NZD
Retailer 2$3,704 NZD
Retailer 8$4,494 NZD
Retailer 4$4,823 NZD
Retailer 3$5,335 NZD
MOH London$8,129 NZD

46 data points across 11 retailers

13 retailers$1,085 NZD to $8,129 NZD

A
Cheapest Retailer
-
$1,085 NZD
B+
Retailer 2
-
$2,453 NZD
View
B+
Retailer 3
-
$2,670 NZD
View
B+
Retailer 4
-
$2,748 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
B
Retailer 10
-
$4,823 NZD
View
B
Retailer 11
-
$5,166 NZD
View
B
Retailer 12
-
$5,335 NZD
View
Most Expensive
B
MOH London
LG425066489 · Nov 3
$8,129 NZD
£3,598 GBP
View
12 more retailers have this diamond
Prices start from $1,085 NZDSave up to $7,043 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
$1,085 NZD