Marquise|Natural|GIA

1.21ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 3545470834

Certificate GIA 3545470834

Diamond specifications and retailer prices

From $4,420 USD
As of November 6, 2026
Save $4,243 USD (49%) vs most expensive(unlock to see where)
27 retailers carry this diamond
Most expensive: $9,835 USD at NZ Jewellers · As of September 29, 2026
View at NZ Jewellers

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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3545470834. Listed at 27 retailers as of November 2, 2026, with a 96% 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

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

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.94°
Pavilion angle38.52°
OriginNatural
Grading LabGIA
CertificateGIA 3545470834
Dimensions11.52 × 5.23 × 3.31 mm
L/W Ratio2.20
Top View
11.52 mm5.23 mm1.21 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 3545470834
Side View
Table 57.0%Crown 38.94°Girdle: VTK-ETKPavilion 38.52°Culet: NoneDepth 63.3%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: $5,705 USD|Low: $4,420 USD|High: $8,768 USD|Avg: $5,739 USD|-1.8%
Retailer 1
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 9$4,420 USD
Retailer 12$4,530 USD
Retailer 3$4,646 USD
Retailer 13$4,777 USD
Retailer 2$4,918 USD
Retailer 4$4,995 USD
Retailer 11$5,327 USD
Retailer 7$5,680 USD
Retailer 1$5,705 USD
Retailer 5$5,920 USD
Retailer 6$6,388 USD
Retailer 8$7,175 USD
Retailer 10$8,663 USD

37 data points across 13 retailers

27 retailers$4,420 USD to $8,663 USD

B+
Cheapest Retailer
-
$4,420 USD
Retailer 2
-
$4,530 USD
View
Price last confirmed 10 days ago
B
Retailer 3
-
$4,646 USD
View
B
Retailer 4
-
$4,777 USD
View
B
Retailer 5
-
$4,918 USD
View
Final sale: no returns
B
Retailer 6
-
$4,995 USD
View
B
Retailer 7
-
$5,269 USD
View
Retailer 8
-
$5,327 USD
View
Price last confirmed 47 days ago
Retailer 9
-
$5,327 USD
View
Price last confirmed 9 days ago
Retailer 10
-
$5,327 USD
View
Price last confirmed 30 days ago
Retailer 11
-
$5,327 USD
View
Price last confirmed 37 days ago
Retailer 12
-
$5,327 USD
View
Price last confirmed 30 days ago
B
Retailer 13
-
$5,680 USD
View
B
Retailer 14
-
$5,705 USD
View
B
Retailer 15
-
$5,730 USD
View
B
Retailer 16
-
$5,730 USD
View
B
Retailer 17
-
$5,920 USD
View
Retailer 18
-
$5,920 USD
View
Price last confirmed 34 days ago
B
Retailer 19
-
$6,030 USD
View
Retailer 20
-
$6,147 USD
View
Price last confirmed 29 days ago
Retailer 21
-
$6,147 USD
View
Price last confirmed 47 days ago
B
Retailer 22
-
$6,388 USD
View
Retailer 23
-
$6,487 USD
View
Price last confirmed 23 days ago
B
Retailer 24
-
$7,175 USD
View
B
Retailer 25
-
$8,663 USD
View
Retailer 26
-
$9,835 USD
View
Price last confirmed 48 days ago
Most Expensive
NZ Jewellers
459c1db7-adb0-4f6b-b8b4-25e2df4126ac · Sep 29
$9,835 USD
View
Price last confirmed 38 days ago
26 more retailers have this diamond
Prices start from $4,420 USDSave up to $4,243 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
$4,420 USD