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Diamond Price Guides & Size Charts for the Trade

Diamond Price Guides & Size Charts for the Trade

G
Guru Diam
Updated Oct 20, 2026 7 min read

Diamond prices move with carat weight, color, clarity, cut and whether a diamond is natural or lab-grown. Our price guides take one weight at a time, from 0.5 carat up to 5 carats, and explain what drives the spread inside each size. Lab-grown and natural have separate guides because they price differently. Prices change often, so the guides explain how pricing works and what to check, and leave live numbers to our trade portal.

The size charts sit alongside them. Carat weight alone doesn't tell you how big a diamond looks, so the charts give millimeter sizes by shape and weight. For melee and small rounds, use the mm to carat charts in the melee guide.

The pricing section covers the business side: wholesale and retail markups for lab-grown and natural, how tariffs affect US inventory, how certification costs compare between labs, and how to talk about price with a customer choosing between lab-grown and natural. Approved trade accounts see live wholesale prices on our stock, and accounts submitted before 4 PM ET are approved the same business day.

There are natural guides at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4 and 4.5 carats and a matching lab-grown set, so you can compare the two at the same weight. The market articles cover the Rapaport price list, price indexes and trends, rough diamond prices and colored diamond price charts. For retailers, the markup articles explain how to price lab-grown and natural at retail and how to answer questions about resale value. The cost articles look at what buying really costs: speculative stock against made to order, one vendor against several, and an in-house bench against outsourcing. The size charts also cover ring sizes, average engagement ring carat sizes, and the difference between carat and karat, which customers often mix up.

For current trade prices, see the Guru Diam Wholesale Price List (loose lab-grown diamonds, per carat) and our wholesale lab-grown jewelry prices (pendants, tennis necklaces, bracelets and studs).

Pricing a made to order piece? Our custom jewelry cost guide shows how CAD, gold by weight, setting and diamonds add up, and the custom jewelry manufacturing service covers turnaround.

Size charts and pricing tools

Diamond size chart · Ring size chart · Lab-grown diamonds · Wholesale hub · Open a trade account

Start here: the most-read price guides

Wholesale diamond pricing and markets

Diamond price guides by carat

Diamond size charts

Diamond pricing questions from the trade

How much is a 0.5 carat lab-grown diamond?

It depends on color, clarity, cut and certification, and lab-grown prices change often. The 0.5 carat price guide explains what moves the price, and trade accounts see live prices on our stock.

How do I see Guru Diam wholesale prices?

Open a trade account. Accounts submitted before 4 PM ET are approved the same business day; later submissions are approved the next business day.

What payment methods do you accept?

Wire, ACH, checks and debit card. Established accounts can get credit terms. We don't accept credit cards.

Do you offer memo?

Yes, memo terms are available for approved accounts.

Why do lab-grown diamonds cost less than natural?

Lab-grown diamonds are produced to order, so supply isn't limited the way mined supply is. Our natural vs lab-grown price article goes through the gap in detail.

Next step

Open a trade account to see live prices, or use the diamond size chart.

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