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Round|Lab Grown|IGI

1.55ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG487108204

Shape and cutting style on the report: Round brilliant

Certificate IGI LG487108204

Diamond specifications and retailer prices

From £1,075 GBP
$1,440 USD
As of October 29, 2026
Save £657 GBP (38%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,516 GBP at Loose Grown Diamond · As of October 26, 2026
View at Loose Grown Diamond

About this 1.55ct lab-grown round diamond

This 1.55ct lab-grown round 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 LG487108204 or 487108204. Listed at 13 retailers as of October 29, 2026, with a 61% 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

1.55
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG487108204
Dimensions7.38 × 7.40 × 4.61 mm
L/W Ratio1.00
Girdle conditionFaceted
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
7.38 mm7.40 mm1.55 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG487108204
Side View
Table 56.5%Crown 35.9°GirdlePavilion 40.8°Culet: NoneDepth 62.5%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £2,516 GBP|Low: £1,075 GBP|High: £4,643 GBP|Avg: £2,432 GBP|+0.7%
Loose Grown Diamond
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 6£1,075 GBP
Retailer 5£1,383 GBP
Retailer 8£1,549 GBP
Retailer 7£1,605 GBP
Retailer 9£1,731 GBP
Retailer 2£2,197 GBP
Loose Grown Diamond£2,516 GBP
Retailer 4£2,699 GBP
Retailer 10£4,363 GBP
Retailer 3£4,607 GBP

41 data points across 10 retailers

13 retailers£1,075 GBP to £1,731 GBP

B
Cheapest Retailer
-
£1,075 GBP
$1,440 USD
B
Retailer 2
-
£1,383 GBP
$1,853 USD
View
B
Retailer 3
-
£1,505 GBP
$2,016 USD
View
B
Retailer 4
-
£1,549 GBP
$2,075 USD
View
Final sale: no returns
Retailer 5
-
£1,605 GBP
$2,150 USD
View
Price last confirmed 18 days ago
B
Retailer 6
-
£1,605 GBP
$2,150 USD
View
B
Retailer 7
-
£1,731 GBP
$2,320 USD
View
Retailer 8
-
£2,197 GBP
View
Price under review
Most Expensive
Loose Grown Diamond
487108204 · Oct 26
£2,516 GBP
$3,371 USD
View
Price under review
8 more retailers have this diamond
Prices start from £1,075 GBPSave up to £657 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
1.55ct Round
£1,075 GBP