One of the most important parts of being a lash artist is knowing how to choose the perfect eyelash extension curl, diameter, and length for each client. No two clients are the same, and customizing their lash set based on their natural lashes, eye shape, and personal style is what sets you apart as a pro.

As a lash artist I know how overwhelming it can feel to pick from all the options. But don’t worry—I’ve got you covered! Let’s dive into how to select the right curl, diameter, and length to give your clients their dream lashes.

The curl of an eyelash extension determines how lifted and dramatic the lashes will look. Here are the most common curl types and when to use them:

1. J Curl

Look: Subtle lift, almost straight.

Best For: Clients with naturally straight lashes who want a super-natural look.

Pro Tip: Avoid J curls for clients with downward-facing lashes—it can make their eyes appear droopy.

2. B Curl

Look: Slight curl for a natural enhancement.

Best For: Clients with slightly curved natural lashes who want a little extra lift.

3. C Curl

Look: Classic curl with a noticeable lift.

Best For: A go-to for most clients; works well for creating an open-eye effect.

Pro Tip: Great for clients with almond or round eye shapes.

4. D Curl

Look: Dramatic curl with maximum lift.

Best For: Clients who love a bold, glam look or have naturally curled lashes.

Pro Tip: Works wonders for clients with hooded eyes, making them appear more open.

5. L and L+ Curl

Look: Flat base with a sharp curl.

Best For: Clients with downward-facing lashes or deep-set eyes.

Pro Tip: L curls help lashes sit up beautifully without stressing the natural lash.

The diameter of an extension determines how thick or thin it is, which affects both the look and the health of the client’s natural lashes.

Common Diameters

0.15mm: Perfect for classic sets; lightweight and safe for most natural lashes.

0.18mm: Creates a fuller look while still maintaining a natural vibe.

0.20mm: Adds extra drama but should only be used on clients with strong natural lashes.

How to Choose the Right Diameter

For Fine or Weak Natural Lashes: Stick with thinner diameters like 0.15mm to avoid strain.

For Strong Natural Lashes: You can go up to 0.18mm or 0.20mm for a thicker look.

For Volume Sets: Use thinner diameters (0.03mm to 0.07mm) to create lightweight fans.

Pro Tip: Always consider the health of your client’s natural lashes before selecting a diameter. The wrong size can lead to damage or premature shedding.

Length is where things get fun, but it’s also where you need to be careful. Going too long can cause stress on natural lashes, while going too short might not give your client the wow factor they’re looking for.

Common Lengths

7mm to 9mm: Great for inner corners or clients who want a super-natural look.

10mm to 12mm: A classic choice for most lash sets; adds noticeable length without overdoing it.

13mm to 15mm: Perfect for clients who want a little more drama.

16mm and Above: Reserved for bold, dramatic sets on clients with strong natural lashes.

How to Choose the Right Length

Eye Shape Matters:

-For round eyes, use longer lashes in the middle for an open-eye effect.

-For almond eyes, focus longer lashes on the outer corners for a cat-eye look.

-For hooded eyes, keep the length shorter to avoid a heavy appearance.

Natural Lash Length: Extensions should be no more than 2-3mm longer than the natural lash to avoid stress.

Pro Tip: Mix lengths throughout the set to create a more natural, textured look.

The magic happens when you combine curl, diameter, and length to create a set tailored to your client. Here’s how:

Step 1: Assess the Natural Lashes

Examine your client’s natural lash strength, curl, and length. This will guide your decisions.

Step 2: Consider Eye Shape and Desired Look

Ask your client if they want a natural or dramatic effect and choose a curl and length that enhances their eye shape.

Step 3: Blend for Dimension

Mix different lengths and curls to add texture and dimension to the set. For example, use D curl on the outer corners and C curl in the middle for a hybrid effect.

At The Lash Professional, we offer a wide range of eyelash extension curl, diameter, and length options so you can create stunning, customized sets for every client.

What Makes Us Different?

Premium Quality: Our lashes are lightweight, durable, and designed for flawless application.

Variety: From subtle B curls to dramatic D curls, we’ve got it all.

Support for Artists: Our training programs teach you everything you need to know about choosing the right extensions for your clients.

Shop our lash extensions here.

1. Can I Mix Different Curls in One Set?

Absolutely! Mixing curls can add dimension and create a unique look.

2. What’s the Best Diameter for Volume Lashes?

For volume fans, stick with thinner diameters like 0.03mm to 0.07mm to keep the set lightweight and safe.

3. How Do I Avoid Overloading Natural Lashes?

Choose extensions that are no more than 2-3mm longer and one step thicker than the natural lash.

Customizing the eyelash extension curl, diameter, and length for your clients is what makes you a true pro. By understanding their natural lashes, eye shape, and desired look, you can create stunning sets that keep them coming back for more.

And remember, the quality of your tools matters just as much as your skills. With premium products from The Lash Professional, you’ll have everything you need to deliver flawless results every time.