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Radiant|Lab Grown|IGI

1.65ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG510184285

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG510184285

Diamond specifications and retailer prices

From $1,751 AUD
$1,230 USD
As of October 29, 2026
Save $3,079 AUD (64%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $5,252 AUD at NZ Jewellers · As of October 28, 2026
View at NZ Jewellers

About this 1.65ct lab-grown radiant diamond

This 1.65ct lab-grown radiant sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG510184285 or 510184285. Listed at 13 retailers as of October 29, 2026, with a 176% 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

1.65
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.1°
Pavilion angle34.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG510184285
Dimensions8.16 × 6.15 × 3.88 mm
L/W Ratio1.33
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
8.16 mm6.15 mm1.65 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG510184285
Side View
Table 68.0%Crown 39.1°Girdle: Slightly ThickPavilion 34.7°Culet: NoneDepth 63.1%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $3,971 AUD|Low: $1,751 AUD|High: $8,109 AUD|Avg: $4,352 AUD|-0.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 5$1,751 AUD
Retailer 4$2,416 AUD
Retailer 8$2,705 AUD
Retailer 6$2,802 AUD
Retailer 1$3,971 AUD
Retailer 7$4,400 AUD
Retailer 3$4,830 AUD
Retailer 9$7,686 AUD
Retailer 2$8,011 AUD

41 data points across 9 retailers

13 retailers$1,751 AUD to $4,830 AUD

B
Cheapest Retailer
-
$1,751 AUD
$1,230 USD
B
Retailer 2
-
$2,416 AUD
$1,697 USD
View
B
Retailer 3
-
$2,628 AUD
$1,846 USD
View
B
Retailer 4
-
$2,705 AUD
$1,900 USD
View
Final sale: no returns
B
Retailer 5
-
$2,802 AUD
$1,968 USD
View
Retailer 6
-
$2,802 AUD
$1,968 USD
View
Price last confirmed 19 days ago
B
Retailer 7
-
$3,039 AUD
$2,135 USD
View
B
Retailer 8
-
$3,971 AUD
£2,197 GBP
View
B
Retailer 9
-
$4,400 AUD
$3,091 USD
View
B
Retailer 10
-
$4,830 AUD
$3,393 USD
View
Most Expensive
NZ Jewellers
230c0e69-5f14-49ce-b077-d8d716cbaf8f · Oct 28
$5,252 AUD
$3,689 USD
View
Price under review
10 more retailers have this diamond
Prices start from $1,751 AUDSave up to $3,079 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
1.65ct Radiant
$1,751 AUD