Radiant|Lab Grown|IGI

1.28ct D SI1 Radiant Lab Grown Diamond

VG • D/SI1 • IGI LG817638986

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG817638986

Diamond specifications and retailer prices

From €1,146 EUR
$1,280 USD
As of October 28, 2026
11 retailers carry this diamond
Most expensive: €1,146 EUR at Brilliant Earth
View at Brilliant Earth

About this 1.28ct lab-grown radiant diamond

This 1.28ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG817638986 or 817638986. Listed at 11 retailers as of October 28, 2026. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.28
Carat
D
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.6°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817638986
Dimensions7.82 × 5.26 × 3.65 mm
L/W Ratio1.49
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.82 mm5.26 mm1.28 ctD / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817638986
Side View
Table 66.0%Crown 42.6°Girdle: Slightly ThickPavilion 35.4°Culet: NoneDepth 69.4%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 28
Current: €1,146 EUR|Low: €143 EUR|High: €1,173 EUR|Avg: €480 EUR|-2.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 23, 2026
Retailer 12€149 EUR
Retailer 4€226 EUR
Retailer 5€280 EUR
Retailer 2€313 EUR
Retailer 9€343 EUR
Retailer 11€426 EUR
Retailer 10€461 EUR
Retailer 8€565 EUR
Retailer 3€584 EUR
Retailer 7€627 EUR
Retailer 6€781 EUR
Brilliant Earth€1,146 EUR

29 data points across 12 retailers

11 retailers

Retailer 1
-
€226 EUR
$252 USD
Price last confirmed 12 days ago
Retailer 2
-
€280 EUR
£246 GBP
View
Price last confirmed 11 days ago
Retailer 3
-
€313 EUR
View
Price last confirmed 10 days ago
Retailer 4
-
€343 EUR
£302 GBP
View
Price last confirmed 10 days ago
Retailer 5
-
€426 EUR
$476 USD
View
Price last confirmed 9 days ago
Retailer 6
-
€461 EUR
$515 USD
View
Price last confirmed 11 days ago
Retailer 7
-
€565 EUR
$631 USD
View
Price last confirmed 11 days ago
Retailer 8
-
€584 EUR
$652 USD
View
Price last confirmed 12 days ago
Retailer 9
-
€627 EUR
$700 USD
View
Price last confirmed 14 days ago
Retailer 10
-
€781 EUR
£687 GBP
View
Price last confirmed 12 days ago
Most Expensive
B
Brilliant Earth
20775780A · Oct 28
€1,146 EUR
$1,280 USD
View
10 more retailers have this diamond

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.

B
1.28ct Radiant
€1,146 EUR