CaratHunter
Plans
Round|Lab Grown|IGI

1.21ct D SI2 Round Lab Grown Diamond

ID • D/SI2 • IGI LG12746512

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12746512

Diamond specifications and retailer prices

From £532 GBP
As of November 5, 2026
Save £173 GBP (25%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £705 GBP at The Diamond Guys · As of November 6, 2026
View at The Diamond Guys

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG12746512 or 12746512. Listed at 2 retailers as of November 5, 2026, with prices from £532 to £705, a £173 spread on the same certified stone. The Diamond Guys lists it at £705. 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

1.21
Carat
D
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12746512
Dimensions6.80 × 6.83 × 4.19 mm
L/W Ratio1.00
Culet sizePointed
Cert comments
As Grown - No indications of post-growth treatment. This Laboratory Grown Diamond was created by High Pressure High Tempertature (HPHT) growth process.
Top View
6.80 mm6.83 mm1.21 ctD / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12746512
Side View
Table 59.5%Crown 35°Girdle: SKFPavilion 40.7°Culet: NoneDepth 61.5%

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: Nov 5
Current: £532 GBP|Low: £352 GBP|High: £719 GBP|Avg: £480 GBP|+0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
The Diamond Guys
August 3, 2026
Retailer 3£352 GBP
Retailer 2£433 GBP
Retailer 4£476 GBP
Retailer 1£532 GBP
The Diamond Guys£705 GBP

20 data points across 5 retailers

2 retailers£532 GBP to £705 GBP

B
Cheapest Retailer
-
£532 GBP
Most Expensive
B
The Diamond Guys
1779253404 · Nov 6
£705 GBP
$949 USD
View
1 more retailer has this diamond
Prices start from £532 GBPSave up to £173 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
1.21ct Round
£532 GBP