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Round|Lab Grown|IGI

3.12ct G IF Round Lab Grown Diamond

ID • G/IF • IGI LG591311621

Shape and cutting style on the report: Round brilliant

Certificate IGI LG591311621

Diamond specifications and retailer prices

From £594 GBP
$796 USD
As of October 31, 2026
Save £3,556 GBP (86%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,150 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 3.12ct lab-grown round diamond

This 3.12ct lab-grown round sits in the three to five carat band, graded G colour (near-colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG591311621 or 591311621. Listed at 21 retailers as of October 31, 2026, with prices from £594 to £4,150, a £3,556 spread on the same certified stone. Brilliant Earth lists it at £4,150. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

3.12
Carat
G
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG591311621
Dimensions9.31 × 9.35 × 5.78 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II Faint Blue
Top View
9.31 mm9.35 mm3.12 ctG / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG591311621
Side View
Table 57.0%Crown 35.3°Girdle: MediumPavilion 40.8°Culet: NoneDepth 62.0%

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: Oct 31
Current: £4,150 GBP|Low: £594 GBP|High: £6,292 GBP|Avg: £1,600 GBP|-34.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 1, 2026
Retailer 4£594 GBP
Retailer 3£899 GBP
Retailer 6£975 GBP
Retailer 7£977 GBP
Retailer 11£1,014 GBP
Retailer 8£1,015 GBP
Retailer 9£1,390 GBP
Retailer 10£1,429 GBP
Retailer 12£1,516 GBP
Retailer 5£1,716 GBP
Retailer 13£1,993 GBP
Retailer 2£2,417 GBP
Brilliant Earth£4,150 GBP

42 data points across 13 retailers

21 retailers£594 GBP to £4,150 GBP

Retailer 1
-
£531 GBP
$711 USD
Price last confirmed 22 days ago
Retailer 2
-
£577 GBP
$773 USD
View
Price last confirmed 19 days ago
A
Retailer 3
-
£594 GBP
$796 USD
View
Final sale: no returns
Retailer 4
-
£616 GBP
$825 USD
View
Price last confirmed 16 days ago
Retailer 5
-
£616 GBP
$825 USD
View
Price last confirmed 15 days ago
A
Retailer 6
-
£899 GBP
$1,204 USD
View
A
Retailer 7
-
£975 GBP
View
A
Retailer 8
-
£977 GBP
€1,247 EUR
View
A
Retailer 9
-
£1,014 GBP
$1,358 USD
View
A
Retailer 10
-
£1,015 GBP
$1,360 USD
View
B+
Retailer 11
-
£1,390 GBP
A$2,865 AUD
View
A
Retailer 12
-
£1,429 GBP
ZAR 30,930 ZAR
View
B+
Retailer 13
-
£1,516 GBP
$2,031 USD
View
B+
Retailer 14
-
£1,716 GBP
$2,299 USD
View
Retailer 15
-
£1,730 GBP
$2,318 USD
View
Price last confirmed 25 days ago
B+
Retailer 16
-
£1,818 GBP
$2,436 USD
View
B+
Retailer 17
-
£1,993 GBP
$2,671 USD
View
B+
Retailer 18
-
£2,099 GBP
$2,812 USD
View
B+
Retailer 19
-
£2,122 GBP
$2,843 USD
View
B+
Retailer 20
-
£2,417 GBP
View
Most Expensive
B
Brilliant Earth
10022304A · Oct 31
£4,150 GBP
$5,560 USD
View
20 more retailers have this diamond
Prices start from £594 GBPSave up to £3,556 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
3.12ct Round
£594 GBP