Marquise|Natural|GIA

1.21ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 1558196256

Certificate GIA 1558196256

Diamond specifications and retailer prices

From $5,145 USD
As of November 5, 2026
Save $1,298 USD (20%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $6,443 USD 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1558196256. Listed at 3 retailers as of November 5, 2026, with prices from $5,145 to $6,443, a $1,298 spread on the same certified stone. 77 Diamonds lists it at $6,443. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
I
Color
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.51°
Pavilion angle41.34°
OriginNatural
Grading LabGIA
CertificateGIA 1558196256
Dimensions9.88 × 5.41 × 3.63 mm
L/W Ratio1.83
Culet sizeNone
Top View
9.88 mm5.41 mm1.21 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558196256
Side View
Table 64.0%Crown 41.51°Girdle: STK-VTKPavilion 41.34°Culet: NoneDepth 67.0%

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: Nov 5
Current: $6,443 USD|Low: $2,762 USD|High: $6,665 USD|Avg: $4,791 USD|+1.1%
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
November 6, 2026
Retailer 3$2,762 USD
Retailer 10$3,765 USD
Retailer 7$3,928 USD
Retailer 12$4,048 USD
Retailer 5$4,427 USD
Retailer 8$4,685 USD
Retailer 13$4,690 USD
Retailer 11$4,728 USD
Retailer 6$5,145 USD
Retailer 2$5,982 USD
Retailer 9$6,129 USD
77 Diamonds$6,443 USD
Retailer 4$6,665 USD

35 data points across 13 retailers

3 retailers$5,145 USD to $6,443 USD

B
Cheapest Retailer
-
$5,145 USD
C
Retailer 2
-
$5,982 USD
View
Most Expensive
C
77 Diamonds
MQMBY8VBCHFH · Nov 6
$6,443 USD
£5,073 GBP
View
2 more retailers have this diamond
Prices start from $5,145 USDSave up to $1,298 USD

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
$5,145 USD