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0.30-Carat Round Diamond

Order now for free delivery loose on Thursday, June 2 or set in jewelry on Friday, June 3.
Stock number
Price per carat
Carat weight
Very Good
Length/width ratio
Depth %
Table %
Very Good
Very Good
Very Thin to Medium, Faceted
4.36 x 4.34 x 2.68 mm
All of our certified diamonds are backed by our Diamond Price Guarantee. Learn More
Canadian Diamond
Each Canadian diamond purchased from Blue Nile is accompanied by a Canadian diamond certificate stating the cut, rough weight, polished weight and Canadian certification number.

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Your questions or feedback are always welcome at Blue Nile. Join in a conversation with one of our Diamond and Jewelry Consultants to help you make the right decision.

Sample Photo Sample Photo Diamond Diagram Diamond Diagram
Diamond Grading Report

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Canadian Diamond
Each Canadian diamond purchased from Blue Nile is accompanied by a Canadian diamond certificate stating the cut, rough weight, polished weight and Canadian certification number.
About Your Blue Nile Diamond

Diamond Size: 0.3 Carat

The international unit of weight used for measuring diamonds and gemstones, 1 carat is equal to 200 milligrams, or 0.2 grams. A specific measurement of a diamond's weight, carat weight alone may not accurately represent a diamond's visual size. Learn More

We recommend considering carat weight along with two other influential characteristics: the overall dimensions and the cut grade of the diamond.

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.25 Ct. (4.1 mm)
.5 Ct. (5.1 mm)
.75 Ct. (5.8 mm)
1 Ct. (6.4 mm)
1.25 Ct. (6.9 mm)
1.5 Ct. (7.4 mm)
1.75 Ct. (7.8 mm)
2 Ct. + (8.1 mm)
17.9 mm  
Diamond Selected
Diamond Selected

Cut: Very Good

Very Good cut: Very slightly less measurable fire or sparkle than an ideal cut diamond, at a more affordable price.

Want to learn even more about cut? Learn More

A cut grade is the measure of a diamond's light performance. Cut with proper proportions, light is returned out of the top of the diamond. If it is cut too shallow, light leaks out of the bottom; too deep and it escapes out of the side.

Diamond Cut

Color: F

F color: A "colorless" grade appreciated best set in platinum or white gold. Faint color detectable by a trained gemologist.

Want to learn even more about color? Learn More

  • For the purist, look for a colorless diamond with a grade of D-F for a diamond with no discernible color.
  • For an excellent value in a diamond with little or no noticeable color to the unaided eye, look for a near-colorless grade of G-I
Not Carried At Blue Nile
Blue Nile Diamonds
Noticeable color

Clarity: VVS1

VVS1-VVS2: Very, very slightly included. Characteristics miniscule and difficult to see under 10x magnification, even to a trained eye.

Want to learn even more about clarity? Learn More

  • Clarity refers to a diamond's relative absence of tiny, natural characteristics known as blemishes and inclusions.
  • Many of these characteristics are microscopic and do not affect a diamond's beauty in any discernible way.
Representative diamond under high magnification.

Diamond Price Guarantee

The Blue Nile Diamond Price Guarantee makes it easy to purchase diamonds with peace of mind. If you find a comparable GIA certified diamond at a lower price, call 1 888-565-7641. If the offer meets our qualifications, we'll match the price. There is no comparison when it comes to the value and quality of Blue Nile diamonds.

The following terms and conditions apply to our Diamond Price Guarantee program.

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Blue Nile Diamond Upgrade Program

  • All GIA and AGSL certified diamonds purchased from Blue Nile are eligible.
  • You will receive credit equal to 100% of the original price toward the purchase of a new diamond.
  • The price of your new diamond must be at least twice the price of your original diamond.
  • Your diamond must be in its original condition with the original diamond grading report.
  • Any damage to the original diamond may disqualify the diamond from the diamond upgrade program.

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Shipping Details

Order by:
4PM EDT tomorrow
Receive on:
Thursday, June 2 loose -or- Friday, June 3 when set in jewelry
Free shipping via:
FedEx Priority Overnight®
Need it Faster?
Order a Blue Nile Signature Diamond before 4PM EDT and receive your diamond the next day

Note: Prices and availability are subject to change without notice. View our terms and conditions for more information.

Financing Options

Flexible payment options available with Blue Nile Credit Card. Learn More

  • 12 month financing available for orders of $1,500 or more.
  • 48 month financing available for orders of $4,000 or more.

Subject to credit approval.