CaratHunter
Plans
Round|Lab Grown|IGI

1.09ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG654412899

Shape and cutting style on the report: Round brilliant

Certificate IGI LG654412899

Diamond specifications and retailer prices

From $153 USD
As of October 29, 2026
Save $890 USD (85%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $6,943 USD at Rare Carat · As of August 9, 2026
View at Rare Carat

About this 1.09ct lab-grown round diamond

This 1.09ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG654412899 or 654412899. Listed at 22 retailers as of October 28, 2026, with a 581% 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

1.09
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG654412899
Dimensions6.60 × 6.56 × 4.08 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.60 mm6.56 mm1.09 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG654412899
Side View
Table 56.0%Crown 35.9°Girdle: MediumPavilion 40.5°Culet: NoneDepth 62.1%

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: Oct 29
Current: $420 USD|Low: $120 USD|High: $1,043 USD|Avg: $467 USD
Rare Carat
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
October 29, 2026
Retailer 7$153 USD
Retailer 5$171 USD
Retailer 3$189 USD
Retailer 15$189 USD
Retailer 9$310 USD
Retailer 2$328 USD
Retailer 16$346 USD
Retailer 11$370 USD
Rare Carat$420 USD
Retailer 14$436 USD
Retailer 12$480 USD
Retailer 13$510 USD
Retailer 4$515 USD
Retailer 8$609 USD
Retailer 6$664 USD
Retailer 10$890 USD
Retailer 17$1,043 USD

44 data points across 17 retailers

22 retailers$153 USD to $1,043 USD

A
Retailer 1
-
$151 USD
Price last confirmed 37 days ago
A
Retailer 2
-
$153 USD
View
A
Retailer 3
-
$171 USD
View
Final sale: no returns
A
Retailer 4
-
$185 USD
View
Price last confirmed 37 days ago
A
Retailer 5
-
$189 USD
View
A
Retailer 6
-
$189 USD
View
A
Retailer 7
-
$310 USD
View
A
Retailer 8
-
$328 USD
£259 GBP
View
A
Retailer 9
-
$346 USD
View
B+
Retailer 10
-
$370 USD
€352 EUR
View
B+
Retailer 11
-
$420 USD
View
B+
Retailer 12
-
$436 USD
View
B+
Retailer 13
-
$480 USD
A$738 AUD
View
B+
Retailer 14
-
$510 USD
View
Price last confirmed 13 days ago
B+
Retailer 15
-
$515 USD
View
B+
Retailer 16
-
$577 USD
View
Price last confirmed 37 days ago
B
Retailer 17
-
$604 USD
View
Price last confirmed 38 days ago
B
Retailer 18
-
$609 USD
View
B
Retailer 19
-
$664 USD
View
B
Retailer 20
-
$890 USD
£701 GBP
View
B
Retailer 21
-
$1,043 USD
View
Most Expensive
B
Rare Carat
26153 · Aug 9
$6,943 USD
View
Price under review
21 more retailers have this diamond
Prices start from $153 USDSave up to $890 USD

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
1.09ct Round
$153 USD