Round|Lab Grown|IGI

1.28ct F FL Round Lab Grown Diamond

ID • F/FL • IGI LG840635053

Shape and cutting style on the report: Round brilliant

Certificate IGI LG840635053

Diamond specifications and retailer prices

From $268 USD
As of November 1, 2026
Save $1,870 USD (87%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $2,138 USD at Helzberg Diamonds · As of November 1, 2026
View at Helzberg Diamonds

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 F colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG840635053 or 840635053. Listed at 22 retailers as of November 1, 2026, with prices from $268 to $2,138, a $1,870 spread on the same certified stone. Helzberg Diamonds lists it at $2,138. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
F
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840635053
Dimensions6.96 × 7.00 × 4.27 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.96 mm7.00 mm1.28 ctF / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840635053
Side View
Table 55.0%Crown 33.1°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $2,138 USD|Low: $268 USD|High: $2,530 USD|Avg: $904 USD
Helzberg Diamonds
Retailer 2
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Retailer 22
November 1, 2026
Retailer 9$268 USD
Retailer 5$300 USD
Retailer 3$310 USD
Retailer 6$332 USD
Retailer 21$332 USD
Retailer 20$490 USD
Retailer 2$536 USD
Retailer 17$547 USD
Retailer 10$551 USD
Retailer 19$570 USD
Retailer 4$585 USD
Retailer 13$629 USD
Retailer 22$713 USD
Retailer 7$1,020 USD
Retailer 12$1,067 USD
Retailer 14$1,070 USD
Retailer 8$1,118 USD
Retailer 15$1,171 USD
Retailer 18$1,337 USD
Retailer 11$1,595 USD
Retailer 16$1,770 USD
Helzberg Diamonds$2,138 USD

16 data points across 22 retailers

22 retailers$268 USD to $2,138 USD

A
Cheapest Retailer
-
$268 USD
A
Retailer 2
-
$300 USD
View
Final sale: no returns
A
Retailer 3
-
$310 USD
View
Retailer 4
-
$332 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$332 USD
View
A
Retailer 6
-
$490 USD
View
A
Retailer 7
-
$536 USD
£422 GBP
View
A
Retailer 8
-
$547 USD
€521 EUR
View
A
Retailer 9
-
$551 USD
View
A
Retailer 10
-
$570 USD
ZAR 9,211 ZAR
View
A
Retailer 11
-
$585 USD
View
B+
Retailer 12
-
$629 USD
£496 GBP
View
B+
Retailer 13
-
$713 USD
View
B+
Retailer 14
-
$1,020 USD
View
B
Retailer 15
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$1,067 USD
View
B
Retailer 16
-
$1,070 USD
SGD 1,446 SGD
View
B
Retailer 17
-
$1,118 USD
View
B
Retailer 18
-
$1,171 USD
View
B+
Retailer 19
-
$1,337 USD
£1,053 GBP
View
Retailer 20
-
$1,595 USD
View
Price last confirmed 11 days ago
B
Retailer 21
-
$1,770 USD
View
Most Expensive
B
Helzberg Diamonds
ZXZOKGMJLGLJ · Nov 1
$2,138 USD
View
21 more retailers have this diamond
Prices start from $268 USDSave up to $1,870 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
1.28ct Round
$268 USD