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Round|Natural|GIA

1.50ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6505156143

Certificate GIA 6505156143

Diamond specifications and retailer prices

From $8,920 USD
As of October 25, 2026
Save $9,453 USD (51%) vs most expensive(unlock to see where)
33 retailers carry this diamond
Most expensive: $18,373 USD at Diamond Quarter · As of October 29, 2026
View at Diamond Quarter

About this 1.5ct natural round diamond

This 1.5ct natural round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6505156143. Listed at 33 retailers as of October 25, 2026, with prices from $8,920 to $18,373, a $9,453 spread on the same certified stone. Diamond Quarter lists it at $18,373. 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

1.50
Carat
D
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6505156143
Dimensions7.42 × 7.38 × 4.43 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
7.42 mm7.38 mm1.50 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6505156143
Side View
Table 60.0%Crown 32°Girdle: MED-STKPavilion 41°Culet: NoneDepth 60.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 25
Current: $11,765 USD|Low: $8,118 USD|High: $16,991 USD|Avg: $11,648 USD|-0.9%
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
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
Retailer 21
October 30, 2026
Retailer 20$8,920 USD
Retailer 4$9,139 USD
Retailer 18$9,742 USD
Retailer 7$10,053 USD
Retailer 2$10,194 USD
Retailer 8$10,194 USD
Retailer 9$10,895 USD
Retailer 12$10,933 USD
Retailer 11$11,044 USD
Retailer 21$11,214 USD
Retailer 17$11,228 USD
Retailer 10$11,316 USD
Retailer 5$11,365 USD
Retailer 1$11,765 USD
Retailer 13$12,152 USD
Retailer 14$12,412 USD
Retailer 15$12,705 USD
Retailer 6$12,743 USD
Retailer 19$14,687 USD
Retailer 16$16,006 USD
Retailer 3$16,991 USD

31 data points across 21 retailers

33 retailers$8,920 USD to $18,373 USD

A
Cheapest Retailer
-
$8,920 USD
B+
Retailer 2
-
$9,139 USD
View
B+
Retailer 3
-
$9,280 USD
View
B+
Retailer 4
-
$9,459 USD
View
B+
Retailer 5
-
$9,717 USD
View
B+
Retailer 6
-
$9,742 USD
View
B+
Retailer 7
-
$10,053 USD
CA$13,962 CAD
View
B+
Retailer 8
-
$10,080 USD
View
B+
Retailer 9
-
$10,194 USD
View
Final sale: no returns
B+
Retailer 10
-
$10,194 USD
View
B+
Retailer 11
-
$10,874 USD
View
B+
Retailer 12
-
$10,895 USD
View
B+
Retailer 13
-
$10,933 USD
£8,608 GBP
View
B+
Retailer 14
-
$11,044 USD
View
B+
Retailer 15
-
$11,214 USD
View
B+
Retailer 16
-
$11,228 USD
A$17,274 AUD
View
B+
Retailer 17
-
$11,316 USD
View
B+
Retailer 18
-
$11,316 USD
View
B+
Retailer 19
-
$11,365 USD
View
Retailer 20
-
$11,391 USD
View
Price last confirmed 7 days ago
B+
Retailer 21
-
$11,765 USD
£9,264 GBP
View
B
Retailer 22
-
$11,940 USD
View
B
Retailer 23
-
$11,940 USD
View
B
Retailer 24
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$12,150 USD
View
B
Retailer 25
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$12,152 USD
View
B
Retailer 26
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$12,330 USD
View
B
Retailer 27
-
$12,412 USD
View
B
Retailer 28
-
$12,705 USD
€12,100 EUR
View
B
Retailer 29
-
$12,743 USD
View
Retailer 30
-
$14,687 USD
ZAR 237,269 ZAR
View
Price last confirmed 7 days ago
B
Retailer 31
-
$16,006 USD
£12,603 GBP
View
B
Retailer 32
-
$16,991 USD
View
Most Expensive
B
Diamond Quarter
1.5SI1D65439546KG · Oct 29
$18,373 USD
£14,467 GBP
View
32 more retailers have this diamond
Prices start from $8,920 USDSave up to $9,453 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.

A
1.50ct Round
$8,920 USD