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Round|Lab Grown|IGI

1.20ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG517200392

Shape and cutting style on the report: Round brilliant

Certificate IGI LG517200392

Diamond specifications and retailer prices

From $622 AUD
$437 USD
As of October 30, 2026
Save $1,593 AUD (72%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,707 AUD at MOH London · As of October 29, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG517200392 or 517200392. Listed at 13 retailers as of October 24, 2026, with a 256% 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

1.20
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG517200392
Dimensions6.74 × 6.70 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.74 mm6.70 mm1.20 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG517200392
Side View
Table 59.5%Crown 36.1°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 62.9%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $2,707 AUD|Low: $444 AUD|High: $2,725 AUD|Avg: $1,060 AUD|+0.5%
MOH London
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
October 30, 2026
Retailer 11$555 AUD
Retailer 3$622 AUD
Retailer 14$622 AUD
Retailer 6$641 AUD
Retailer 5$689 AUD
Retailer 12$689 AUD
Retailer 8$847 AUD
Retailer 10$897 AUD
Retailer 7$1,060 AUD
Retailer 13$1,093 AUD
Retailer 2$1,126 AUD
Retailer 9$1,933 AUD
Retailer 4$2,215 AUD
MOH London$2,707 AUD

44 data points across 14 retailers

13 retailers$622 AUD to $2,215 AUD

Retailer 1
-
$555 AUD
$390 USD
Price last confirmed 8 days ago
B+
Retailer 2
-
$622 AUD
$437 USD
View
Final sale: no returns
B+
Retailer 3
-
$622 AUD
$437 USD
View
B+
Retailer 4
-
$641 AUD
$450 USD
View
Retailer 5
-
$689 AUD
$484 USD
View
Price last confirmed 7 days ago
Retailer 6
-
$847 AUD
$595 USD
View
Price last confirmed 9 days ago
B+
Retailer 7
-
$897 AUD
$630 USD
View
B
Retailer 8
-
$1,060 AUD
€709 EUR
View
B
Retailer 9
-
$1,093 AUD
$768 USD
View
B
Retailer 10
-
$1,126 AUD
£623 GBP
View
B
Retailer 11
-
$1,933 AUD
$1,358 USD
View
B
Retailer 12
-
$2,215 AUD
$1,556 USD
View
Most Expensive
MOH London
LG517200392 · Oct 29
$2,707 AUD
£1,497 GBP
View
Price under review
12 more retailers have this diamond
Prices start from $622 AUDSave up to $1,593 AUD

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+
1.20ct Round
$622 AUD