Round|Lab Grown|IGI

1.28ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG602370417

Shape and cutting style on the report: Round brilliant

Certificate IGI LG602370417

Diamond specifications and retailer prices

From $642 USD
£506 GBP
As of October 31, 2026
1 retailer carries this diamond
Only listing: $642 USD at Diamond Quarter
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Diamond Quarter

About this 1.28ct lab-grown round diamond

This 1.28ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG602370417 or 602370417. Listed at a single retailer as of October 31, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

1.28
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG602370417
Dimensions6.98 × 7.00 × 4.30 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.98 mm7.00 mm1.28 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG602370417
Side View
Table 56.0%Crown 34.8°GirdlePavilion 40.9°Culet: NoneDepth 61.4%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: $642 USD|Low: $467 USD|High: $1,250 USD|Avg: $744 USD
Diamond Quarter
Retailer 2
Retailer 3
July 26, 2026
Retailer 3$467 USD
Diamond Quarter$642 USD
Retailer 2$1,000 USD

18 data points across 3 retailers

1 retailer

B
Diamond Quarter
1.28SI1ELG52CBDAN · Oct 31
$642 USD
£506 GBP
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B
1.28ct Round
$642 USD