One of the most sought-after gemstones in the world, diamonds are one of the hardest substances known to man. Diamonds form from carbon under high pressure and temperature.

Why are diamonds so popular?

Fun backstory: diamonds weren't commonly used in engagement rings until 1947, when the British mining company De Beers featured them in an advertising campaign! The rest, as they say, is history. Diamonds now represent financial success, long-term commitment, and status.

What are the "4Cs" when shopping for a diamond?

Cut, carat, color, clarity. Cut is the only human "influence" on a gemstone: round, princess, cushion, marquise and oval are some of the more common shapes given to diamonds. Carat represents the weight of the diamond, with 1 carat equal to 200 milligrams. Color evaluates the stone using letters of the alphabet; the closer to "A", the whiter the stone, though most people find stones in the G-H rating to still be icy-white in appearance. Clarity is a little more difficult for the average consumer to see, especially without magnification: the categories measure inclusions, or irregularities that happen during the formation of the diamonds but are hard to see without magnification, as well as blemishes like scratches or chips.

What's the difference between natural and lab-created diamonds?

The names say it all: natural diamonds come from the earth, while lab-created or synthetic diamonds come from scientists! But, other than their origins, these two types of diamonds are exactly the same chemically and optically: even expert gemologists have a hard time telling them apart without using a jeweler's loupe! And, as you might imagine, synthetic diamonds are usually much more affordable.

What are GIA, AGS, EGL and IGI?

These acronyms all refer to gemological societies and institutes with diamond grading scales used throughout the industry: Gemological Institute of America, American Gemological Society, European Gemological Laboratory, and International Gemological Institute. Generally speaking, GIA and AGS are seen as the most accurate and scientific, so if you're buying a higher-priced stone you may want to ensure that it's been graded by one (or both!) of those two systems.

Why would I buy a loose diamond instead of an already-made engagement ring or other piece of jewelry?

If you're looking for a one-of-a-kind piece, you're not going to find it by buying the first pretty ring or solitaires you see at your local jewelry store. Many customers want something with a story that can be handed down as an heirloom: the shape of the stone chosen to match her eyes, the setting selected to complement his personality, and so on. Buying loose diamonds is the first step in a truly unique piece of jewelry.

Are diamonds a good investment?

While you'll find no shortage of companies wanting to sell you diamonds as an investment, most experts say that the average consumer isn't likely to profit from them. Unless you're buying extremely large diamonds (e.g. 20 carats or more) or ones with a noteworthy history (like being owned by a celebrity), you may have a hard time selling the diamonds you buy for more than you paid. If you're planning on spending a significant amount of money for a diamond, do it because you appreciate the beauty or want to own (or give) something precious - but save your investments for more reliable means of generating profits!

Is it safe to buy loose diamonds online?

Absolutely. Of course, you shouldn't buy a diamond from an online retailer without doing your research: choose a business with a well-established history, preferably with a high rating from the BBB, and be sure that the diamond you buy has been rated and certified by one of the independent institutes or laboratories mentioned above. You can rest assured that the diamond retailer will take every measure to get your stone delivered safely, including tracking and insurance.

Best Diamond Stores for July 2025 | Top Consumer Reviews

Item: The Best Diamond Stores
Rating: 5
Author: Top Consumer Reviews

Sunday, July 20th We evaluate products and services based on unbiased research. Top Consumer Reviews may earn money when you click on a link. Learn more about our process.

2025 Diamond Store Reviews

Here you can see how James Allen and Diamonds USA match up head-to-head in a battle for the Best Diamond Stores in 2025.

James Allen

Over 300,000 diamonds available
Prices range from $1,020 to $1,706,950
360° view of every stone, with up to 40x magnification

For an exceptional diamond selection, consider James Allen, offering over 300,000 diamonds, both natural and lab-created. Accredited with an "A+" rating from the Better Business Bureau and over two decades of experience, it's a reliable choice. Shopping is straightforward, with options for diamond type, shape, cut quality, color, carat, clarity, and price preferences. A standout feature is the Real-Time Diamond Inspection with a certified gemologist. Transparent delivery times and a diverse range of settings with nearly 700 options cater to all tastes. Thousands of positive reviews affirm James Allen's quality, value, and customer service, making it a top choice for diamond shopping.

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Diamonds USA

Over 5,000 diamonds on the site
Price range: from $450 to $200,000+
Natural and lab-created stones on offer

Diamonds USA is based in Tel Aviv, Israel, and specializes in loose diamonds, offering over 5,000 options and the ability to request quotes for more. Their selection includes both lab-created and natural, certified conflict-free diamonds, all with certification and appraisals on demand. However, the inventory here is small by comparison, and the search tool is less-than-intuitive to use. Although this diamond store is still not rated by the BBB, Trustpilot feedback is positive (but limited). Diamonds USA is a decent option for a wide range of gemstones, but consider it as a secondary choice if your preferred diamonds aren't available from our higher-rated stores.

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Have you ever ventured into a local jewelry store with high hopes of finding the perfect stone, only to leave feeling disappointed? You're not alone. Many physical jewelry stores grapple with the challenge of stocking a diverse range of diamonds due to financial and logistical limitations.

In light of this, it's no wonder that an increasing number of diamond shoppers are gravitating towards online retailers. Why confine yourself to a small selection of stones with limited sizes and cuts when you can delve into an extensive assortment of diamonds? These gemstones span across various carat sizes, shapes, clarity levels, and price points. Reputable online establishments offer the convenience of a comprehensive 360° view of each diamond, accompanied by certifications and ratings from well-recognized appraisers.

One of the key drivers behind the increasing popularity of buying loose diamonds online is the unparalleled convenience that digital platforms offer. The traditional process of purchasing diamonds often involved visiting multiple physical stores, engaging with sales representatives, and navigating complex pricing structures. Online platforms simplify this process, letting you explore a vast array of options from the comfort of your home. This convenience factor is particularly appealing to a generation accustomed to the ease of online shopping for various products.

Furthermore, the online diamond market provides you with an extensive selection of diamonds, going beyond the limitations of brick-and-mortar stores. You can easily browse through an array of sizes, shapes, and qualities online. This allows you to find a diamond that perfectly aligns with your preferences and budget.

The acquisition of loose diamonds opens the door to an exhilarating opportunity to craft a distinctive piece of jewelry. Once you've made your diamond selection, the possibilities for designing your jewelry become virtually limitless. The online diamond retailer you opt for is likely to provide an impressive array of settings, encompassing traditional solitaires and inventive tension settings tailored for engagement rings.

As you might expect, the choice of the right retailer matters. Your diamond purchase could become a cherished heirloom passed down through generations, so you'll want to be sure you'll receive precisely what you pay for. To help you in your selection of the ideal diamond retailer, we suggest that you keep the following considerations in mind:

Variety: Check the store's inventory of loose diamonds. Do they offer a wide range of options in terms of cut and size? Can you find a setting that suits your preferences?
Price: Compare prices with other diamond sellers. Are there any special promotions or benefits, such as free shipping, to make your purchase more budget-friendly?
Certification: Does the retailer provide documentation from reputable institutions like GIA, AGS, IGI, or EGL to certify your diamond's qualities? This is especially important for more valuable diamonds to ensure the stated carat size, clarity, and color are accurate.
Reputation: Research what other customers have to say about their experiences with the retailer. Has the Better Business Bureau rated the store, and are there any customer complaints? Buying a diamond can be a significant investment, so it's worth taking the time to make sure the retailer you're considering has a strong track record for honesty and reliability.

Here at Top Consumer Reviews, our experts have evaluated and ranked today's best online diamond retailers. We hope this information assists you in finding the ideal loose diamond for your long-awaited proposal, one-of-a-kind pendant, or a timeless heirloom piece to be passed on for generations.

What are the benefits of buying loose diamonds?

When many people think about diamonds, buying diamond jewelry from a local store immediately comes to mind. However, buying loose diamonds is an option as well. At first glance, it may seem easier to simply walk into a jewelry store and buy a diamond ring or necklace, but the reality is that there are several exciting benefits associated with buying loose diamonds. In fact, with a closer look at the benefits of buying loose diamonds, you may decide that this is the best option for you. What can you expect when you buy loose diamonds?

Online Research

When people initially start shopping for a diamond, they focus on carat weight. While this is an important factor to consider, there are other factors that impact a diamond's true value. In addition to the carat weight, the stone's cut, clarity, and color play a role. These are referred to as the 4Cs of diamonds, and they are reviewed during the diamond certification process. One of the easiest ways to buy loose diamonds is online, and you can conveniently complete online research on all of these important factors before you make your purchase. Some diamonds used in preset jewelry are not certified, so you may not be able to determine the true value of that jewelry.

Not all loose diamonds are certified, but some sources exclusively sell certified diamonds. These are diamonds have been analyzed by a reputable lab, such as GIA, EGL, AGS or a few others. Through the certification process, a diamond's characteristics are mapped. This includes its flaws, dimensions and other key features. In fact, the certification process covers the 4Cs of diamonds. The lab certification report for a specific certified diamond is usually readily available for you to view online when you buy loose diamonds, and this makes it easy for you to understand fully what you are buying before you finalize your purchase. Many jewelry retailers, however, may not provide the certification documents to you unless you specifically request them.

Be aware, however, that you should not assume that the gemstone that you purchase online is the same diamond that you will receive in the mail. You should always obtain an appraisal from a certified professional as soon as you receive your loose diamonds. This holds true if you buy a diamond in a setting. The good news is that it is much easier for an appraiser to inspect and appraise loose diamonds versus those that are in a setting.

Comparison Shopping

Are you concerned about overpaying for diamonds or diamond jewelry? Because of the wealth of online information that is available on certified diamonds for sale, it is easy to comparison shop for the best value within your price range regardless of whether you buy a loose stone or a diamond in a setting.

However, when you purchase a diamond in a setting, there may be a question about how the setting's design and materials impact the total cost of the jewelry. When you purchase a loose diamond that is certified, on the other hand, you will know exactly how much that specific diamond is worth. This gives you some control over both value and cost. Whether you intend to hold loose gemstones or to place a diamond in a setting at a later date, the ability to easily comparison shop will help you to avoid overpaying.

A Financial Investment

The value of both loose diamonds and diamond jewelry will fluctuate over time, but you can expect them to share an upward trajectory over a long period of time. You may assume that loose diamonds will hold their value just as well as diamond jewelry would, but this is not always the case. In fact, loose diamonds generally hold their value better than diamonds that are set in earrings, necklaces, earrings and other settings. This is particularly true when you purchase certified loose diamonds.

Why is this the case? Some of the diamonds used in earrings, necklaces and other pieces have not been certified, so you cannot truly know the value of the gemstones when you buy these prepared pieces. This means that you also cannot truly determine the value of the jewelry, and you risk the possibility of paying more than the item is actually worth. When you buy a certified loose diamond, on the other hand, you will have a record of its value before it is placed in a setting. You will be less likely to overpay for that piece of jewelry, and the value of that jewelry will be partially secured by the diamond certification paperwork.

Keep in mind that many people purchase loose diamonds to hold securely for a period of time. For example, they may store diamonds in a bank's security deposit box or in a locked safe in their own home. The value of diamonds has maintained an upward path over the years, so this could be a smart way for an investor to diversify his or her portfolio.

Access to a Large Selection

Generally, when you shop for diamond jewelry at a local store, you are purchasing the stone and the setting together. You do not usually have the option to change out the diamond. However, the ability to select the specific diamond for your setting gives you greater control over the quality of the finished piece as well as its cost and value. More than that, with the ability to mix and match diamonds and settings, you have access to a greater overall range of possibilities.

Are you wondering how significant this benefit is? A single diamond wholesaler may offer hundreds or even thousands of certified loose diamonds at any given time. With multiple reputable wholesalers available for you to shop with, you will have a huge selection to choose from when you shop for loose diamonds. Some online wholesalers offer a convenient search function so that you can easily narrow down the options specifically to those that meet your requirements for cost and price.

Your Choice of Settings

While many people choose to keep loose diamonds as a financial investment, others shop for a loose diamond with a more specific purpose in mind. For example, you may want to select the exact diamond that will be placed in a custom-made engagement ring or necklace. When you buy a loose diamond for this purpose, the possibilities are endless. A private jeweler may have some predesigned settings for you to choose from, and your selection of a specific diamond for that setting ensures that the jewelry is tailored to your budget and expectations.

Another exciting option is to work with a private jeweler to create a one-of-a-kind piece. Everything from the jewelry's metal and size to its style will be created to your exact specifications. In comparison, if you choose to buy a diamond that is already in a setting, you are truly limited to the possibilities available from that store at the time of your visit.

Diamonds are often used in jewelry that has special meaning, such as a wedding ring, an engagement ring, an anniversary ring and more. These are important pieces that you understandably want to be perfect for the individual and for the occasion. With this in mind, the ability to choose both the loose diamond and the setting is a true benefit.

Get to Know the Possibilities Today

Before you settle for diamond jewelry purchased from a retail store, you owe it to yourself to explore the exciting possibilities available to you with the purchase of loose diamonds. With gemstones available at a wide range of prices and qualities, you could potentially find exactly what you are looking for when you shop for a loose diamond today.

James Allen vs Diamonds USA

2025 Diamond Store Reviews

James Allen

Diamonds USA

Diamond Store FAQ