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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 £918 GBP
$1,230 USD
As of October 29, 2026
Save £1,614 GBP (64%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,753 GBP 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: £2,082 GBP|Low: £918 GBP|High: £4,251 GBP|Avg: £2,278 GBP|-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£918 GBP
Retailer 4£1,267 GBP
Retailer 8£1,418 GBP
Retailer 6£1,469 GBP
Retailer 1£2,082 GBP
Retailer 7£2,307 GBP
Retailer 3£2,532 GBP
Retailer 9£4,029 GBP
Retailer 2£4,200 GBP

42 data points across 9 retailers

13 retailers£918 GBP to £2,532 GBP

B
Cheapest Retailer
-
£918 GBP
$1,230 USD
B
Retailer 2
-
£1,267 GBP
$1,697 USD
View
B
Retailer 3
-
£1,378 GBP
$1,846 USD
View
B
Retailer 4
-
£1,418 GBP
$1,900 USD
View
Final sale: no returns
B
Retailer 5
-
£1,469 GBP
$1,968 USD
View
Retailer 6
-
£1,469 GBP
$1,968 USD
View
Price last confirmed 18 days ago
B
Retailer 7
-
£1,593 GBP
$2,135 USD
View
B
Retailer 8
-
£2,082 GBP
View
B
Retailer 9
-
£2,307 GBP
$3,091 USD
View
B
Retailer 10
-
£2,532 GBP
$3,393 USD
View
Most Expensive
NZ Jewellers
230c0e69-5f14-49ce-b077-d8d716cbaf8f · Oct 28
£2,753 GBP
$3,689 USD
View
Price under review
10 more retailers have this diamond
Prices start from £918 GBPSave up to £1,614 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.

B
1.65ct Radiant
£918 GBP