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Radiant|Lab Grown|GCAL

1.28ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • GCAL 340580931

Shape and cutting style on the report: Radiant brilliant

Certificate GCAL 340580931

Diamond specifications and retailer prices

From $1,974 CAD
£1,113 GBP
As of October 31, 2026
1 retailer carries this diamond
Only listing: $1,974 CAD 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 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 top-tier cut grade and certified by GCAL 340580931. 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
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.5°
Pavilion angle59.2°
OriginLab Grown
Grading LabGCAL
CertificateGCAL 340580931
Dimensions7.84 × 5.33 × 3.60 mm
L/W Ratio1.47
Culet sizeNone
Top View
7.84 mm5.33 mm1.28 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGCAL 340580931
Side View
Table 66.0%Crown 45.5°Girdle: STK-THKPavilion 59.2°Culet: NoneDepth 67.5%

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: $671 CAD|Low: $295 CAD|High: $1,006 CAD|Avg: $766 CAD|-4.8%
Retailer 1
Retailer 2
Retailer 3
June 28, 2026
Retailer 1$671 CAD
Retailer 2$735 CAD
Retailer 3$797 CAD

67 data points across 3 retailers

1 retailer

B
Diamond Quarter
1.28SI1D3431424EN · Oct 31
$1,974 CAD
£1,113 GBP
View

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
$1,974 CAD