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Heart|Lab Grown|GIA

3.21ct G SI1 Heart Lab Grown Diamond

EX • G/SI1 • GIA 1459199399

Certificate GIA 1459199399

Diamond specifications and retailer prices

From £767 GBP
As of November 6, 2026
Save £2,885 GBP (79%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £6,471 GBP at Mervis Diamond Importers · As of November 6, 2026
View at Mervis Diamond Importers

About this 3.21ct lab-grown heart diamond

This 3.21ct lab-grown heart sits in the three to five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1459199399. Listed at 20 retailers as of November 6, 2026, with a 376% 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

3.21
Carat
G
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabGIA
CertificateGIA 1459199399
Dimensions9.39 × 8.14 × 5.51 mm
L/W Ratio1.15
Culet sizeNone
Key to symbols
Feather
Top View
9.39 mm8.14 mm3.21 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1459199399
Side View
Table 63.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 67.7%

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: Nov 6
Current: £6,471 GBP|Low: £748 GBP|High: £6,471 GBP|Avg: £2,026 GBP|+139.1%
Mervis Diamond Importers
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
Retailer 18
Retailer 19
November 6, 2026
Retailer 2£767 GBP
Retailer 5£847 GBP
Retailer 17£874 GBP
Retailer 3£882 GBP
Retailer 16£1,133 GBP
Retailer 6£1,225 GBP
Retailer 14£1,253 GBP
Retailer 12£1,296 GBP
Retailer 7£1,439 GBP
Retailer 4£2,089 GBP
Retailer 18£2,153 GBP
Retailer 10£2,229 GBP
Retailer 8£2,230 GBP
Retailer 13£2,531 GBP
Retailer 15£2,894 GBP
Retailer 11£3,046 GBP
Retailer 19£3,652 GBP
Retailer 9£5,267 GBP
Mervis Diamond Importers£6,471 GBP

31 data points across 19 retailers

20 retailers£767 GBP to £3,652 GBP

Retailer 1
-
£756 GBP
Price last confirmed 25 days ago
A
Retailer 2
-
£767 GBP
View
Final sale: no returns
A
Retailer 3
-
£847 GBP
View
A
Retailer 4
-
£874 GBP
View
A
Retailer 5
-
£882 GBP
View
Retailer 6
-
£1,133 GBP
View
Price last confirmed 14 days ago
B+
Retailer 7
-
£1,225 GBP
View
B+
Retailer 8
-
£1,253 GBP
View
B+
Retailer 9
-
£1,296 GBP
View
B+
Retailer 10
-
£1,439 GBP
View
B
Retailer 11
-
£2,089 GBP
View
B
Retailer 12
-
£2,153 GBP
View
B
Retailer 13
-
£2,229 GBP
View
B
Retailer 14
-
£2,230 GBP
View
B
Retailer 15
-
£2,531 GBP
View
B
Retailer 16
-
£2,894 GBP
View
B
Retailer 17
-
£3,046 GBP
View
B
Retailer 18
-
£3,652 GBP
View
Retailer 19
-
£5,267 GBP
View
Price under review
Most Expensive
Mervis Diamond Importers
1958943385 · Nov 6
£6,471 GBP
$8,661 USD
View
Price under review
19 more retailers have this diamond
Prices start from £767 GBPSave up to £2,885 GBP

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
3.21ct Heart
£767 GBP