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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 $796 USD
As of October 31, 2026
Save $4,764 USD (86%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $5,560 USD 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 $796 to $5,560, a $4,764 spread on the same certified stone. Brilliant Earth lists it at $5,560. 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
Color
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: $5,560 USD|Low: $796 USD|High: $8,430 USD|Avg: $2,140 USD|-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$796 USD
Retailer 3$1,204 USD
Retailer 2$1,307 USD
Retailer 6$1,309 USD
Retailer 11$1,358 USD
Retailer 7$1,360 USD
Retailer 8$1,862 USD
Retailer 9$1,915 USD
Retailer 12$2,031 USD
Retailer 5$2,299 USD
Retailer 13$2,671 USD
Retailer 10$3,242 USD
Brilliant Earth$5,560 USD

43 data points across 13 retailers

21 retailers$796 USD to $5,560 USD

Retailer 1
-
$711 USD
Price last confirmed 21 days ago
Retailer 2
-
$773 USD
View
Price last confirmed 18 days ago
A
Retailer 3
-
$796 USD
View
Final sale: no returns
Retailer 4
-
$825 USD
View
Price last confirmed 15 days ago
Retailer 5
-
$825 USD
View
Price last confirmed 15 days ago
A
Retailer 6
-
$1,204 USD
View
A
Retailer 7
-
$1,307 USD
£1,029 GBP
View
A
Retailer 8
-
$1,309 USD
€1,247 EUR
View
A
Retailer 9
-
$1,358 USD
View
A
Retailer 10
-
$1,360 USD
View
B+
Retailer 11
-
$1,862 USD
A$2,865 AUD
View
A
Retailer 12
-
$1,915 USD
ZAR 30,930 ZAR
View
B+
Retailer 13
-
$2,031 USD
View
B+
Retailer 14
-
$2,299 USD
View
Retailer 15
-
$2,318 USD
View
Price last confirmed 24 days ago
B+
Retailer 16
-
$2,436 USD
View
B+
Retailer 17
-
$2,671 USD
View
B+
Retailer 18
-
$2,812 USD
View
B+
Retailer 19
-
$2,843 USD
View
B+
Retailer 20
-
$3,242 USD
£2,553 GBP
View
Most Expensive
B
Brilliant Earth
10022304A · Oct 31
$5,560 USD
View
20 more retailers have this diamond
Prices start from $796 USDSave up to $4,764 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
3.12ct Round
$796 USD