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Marquise|Natural|GIA

1.21ct G SI1 Marquise Natural Diamond

EX • G/SI1 • GIA 2245015553

Certificate GIA 2245015553

Diamond specifications and retailer prices

From £4,070 GBP
As of November 6, 2026
Save £1,042 GBP (20%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £5,112 GBP at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2245015553. Listed at 5 retailers as of November 6, 2026, with prices from £4,070 to £5,112, a £1,042 spread on the same certified stone. 77 Diamonds lists it at £5,112. 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
G
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle37.12°
Pavilion angle40.34°
OriginNatural
Grading LabGIA
CertificateGIA 2245015553
Dimensions10.18 × 5.50 × 3.61 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.18 mm5.50 mm1.21 ctG / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 2245015553
Side View
Table 56.0%Crown 37.12°Girdle: THN-VTKPavilion 40.34°Culet: NoneDepth 65.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £5,112 GBP|Low: £2,615 GBP|High: £5,821 GBP|Avg: £4,291 GBP|-1.6%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 6, 2026
Retailer 4£2,615 GBP
Retailer 10£3,293 GBP
Retailer 13£3,535 GBP
Retailer 11£3,569 GBP
Retailer 14£3,579 GBP
Retailer 7£4,177 GBP
Retailer 3£4,265 GBP
Retailer 5£4,520 GBP
Retailer 8£4,536 GBP
Retailer 2£4,569 GBP
77 Diamonds£5,112 GBP
Retailer 6£5,202 GBP
Retailer 9£5,405 GBP
Retailer 12£5,821 GBP

27 data points across 14 retailers

5 retailers£4,070 GBP to £5,112 GBP

B+
Cheapest Retailer
-
£4,070 GBP
B
Retailer 2
-
£4,177 GBP
View
B
Retailer 3
-
£4,277 GBP
View
B
Retailer 4
-
£4,569 GBP
View
Most Expensive
B
77 Diamonds
MQMBWCHSV5WM · Nov 6
£5,112 GBP
View
4 more retailers have this diamond
Prices start from £4,070 GBPSave up to £1,042 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 Marquise
£4,070 GBP