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Round|Lab Grown|IGI

1.73ct I SI2 Round Lab Grown Diamond

EX • I/SI2 • IGI LG451057633

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057633

Diamond specifications and retailer prices

From £716 GBP
$960 USD
As of October 30, 2026
Save £1,574 GBP (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,509 GBP at MOH London · As of October 21, 2026
View at MOH London

About this 1.73ct lab-grown round diamond

This 1.73ct lab-grown round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451057633 or 451057633. Listed at 10 retailers as of October 27, 2026, with a 220% 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

1.73
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057633
Dimensions7.67 × 7.63 × 4.72 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.67 mm7.63 mm1.73 ctI / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057633
Side View
Table 60.0%Crown 36.3°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £3,509 GBP|Low: £716 GBP|High: £3,537 GBP|Avg: £1,850 GBP|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 2£716 GBP
Retailer 5£1,146 GBP
Retailer 4£1,180 GBP
Retailer 8£1,360 GBP
Retailer 7£1,673 GBP
Retailer 3£1,929 GBP
Retailer 6£2,218 GBP
Retailer 9£2,736 GBP
MOH London£3,509 GBP

11 data points across 9 retailers

10 retailers£716 GBP to £2,290 GBP

A
Cheapest Retailer
-
£716 GBP
$960 USD
B+
Retailer 2
-
£1,054 GBP
$1,412 USD
View
B+
Retailer 3
-
£1,146 GBP
$1,536 USD
View
B+
Retailer 4
-
£1,180 GBP
$1,581 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,222 GBP
$1,638 USD
View
Retailer 6
-
£1,222 GBP
$1,638 USD
View
Price last confirmed 17 days ago
B
Retailer 7
-
£1,929 GBP
$2,584 USD
View
B
Retailer 8
-
£2,218 GBP
$2,972 USD
View
B
Retailer 9
-
£2,290 GBP
$3,069 USD
View
Most Expensive
MOH London
LG451057633 · Oct 21
£3,509 GBP
View
Price last confirmed 9 days ago
9 more retailers have this diamond
Prices start from £716 GBPSave up to £1,574 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
1.73ct Round
£716 GBP