Onyx 2133-10 by Benjamin Moore

If you’re looking for a paint color that exudes sophistication and depth, Benjamin Moore’s Onyx (2133-10) might just be your perfect match. This deep, near-black shade with subtle red undertones is a designer favorite for a reason—it brings an air of elegance to any space without feeling overly harsh or stark. Whether you’re aiming for a moody bedroom, a dramatic accent wall, or a sleek modern living room, Onyx has the versatility to deliver. But before you commit, let’s dive into everything you need to know to decide if this is the right color for your home.

Onyx sits firmly in the dark gray category, with an LRV (Light Reflectance Value) of just 4.99%, meaning it absorbs almost all light rather than reflecting it. This makes it ideal for creating a cozy, intimate atmosphere, especially in larger rooms where you want to add warmth and grounding. But don’t let its darkness intimidate you—when paired with the right lighting and decor, Onyx can feel surprisingly inviting. Its red undertones add a layer of richness that keeps it from feeling flat or lifeless, giving it a complexity that pure blacks often lack.

One of the biggest strengths of Onyx is its versatility. It plays well with a range of decor styles, from modern and industrial to eclectic and minimalist. Imagine it on an accent wall in a home office, paired with brass fixtures and warm wood tones for a luxe, masculine vibe. Or picture it in a dining room, where it creates a striking backdrop for a gallery wall or a statement chandelier. Even in a bedroom, Onyx can set the stage for a serene retreat when balanced with soft textiles and layered lighting.

When it comes to application, Onyx is a dream to work with. It offers excellent coverage—often needing just one or two coats—and is touch-up friendly, so minor imperfections won’t stand out. You’ll have your choice of finishes, too. A matte finish enhances its velvety depth, while satin adds a subtle sheen that works beautifully in high-traffic areas. If you’re using it on trim or doors, semi-gloss provides durability and makes cleaning a breeze. Just keep in mind that darker colors like Onyx can show dust and fingerprints more easily, so a wipeable finish is a smart choice for busy households.

Lighting is key with a color this deep. In natural light, Onyx reveals its nuanced undertones, but in dimmer spaces, it can read as almost pure black. If you’re working with a smaller room, consider using it sparingly—perhaps on a single wall or on furniture rather than all four walls. Pairing it with lighter furnishings, crisp white trim (Benjamin Moore’s White Dove is a classic pairing), or metallic accents will keep the space from feeling too heavy. And don’t shy away from layering lighting—ambient, task, and accent lights will help balance the darkness and highlight the color’s richness.

For those who love a bold contrast, Onyx shines when paired with its complementary color: green. Think emerald velvet sofas, olive throw pillows, or even lush indoor plants against an Onyx wall. The red undertones in the paint create a dynamic interplay with greens, making both colors pop. If you prefer a monochromatic look, layer it with lighter grays or warm neutrals to keep the space feeling cohesive yet dimensional.

Is Onyx right for every room? Almost—but with a few caveats. It’s fantastic in living rooms, bedrooms, dining rooms, and entryways, where its drama can be fully appreciated. In a home office, it fosters focus and sophistication. However, in very small or poorly lit spaces, it might feel a bit overwhelming unless balanced thoughtfully. Always test a swatch in your space at different times of day to see how the light affects it.

So, should you take the plunge with Onyx? If you’re drawn to deep, moody hues and want a color that adds instant glamour and depth, absolutely. It’s a timeless choice that elevates any design scheme, and its practical benefits—like easy application and durability—make it a smart pick for real-life living. Just remember: with great darkness comes great responsibility (to light it well). Done right, Onyx won’t just color your walls—it’ll transform your entire space into something unforgettable.

Real Room Photo of Onyx 2133-10

Undertones of  Onyx ?

The undertones of Onyx are a key aspect of its character, leaning towards Red. These subtle underlying hues are what give the color its depth and complexity. For example, a gray with a blue undertone will feel cooler and more modern, while one with a brown undertone will feel warmer and more traditional. It’s essential to test this paint in your home and observe it next to your existing furniture, flooring, and decor to see how these undertones interact and reveal themselves throughout the day.

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HEX value: #353434

RGB code: 53, 52, 52

Is  Onyx Cool or Warm?

This color is predominantly cool, which means it can create a calm and collected atmosphere in your space. It works beautifully with warm-toned furnishings, providing a balanced contrast.

Understanding Color Properties and Interior Design Tips

Hue refers to a specific position on the color wheel, measured in degrees from 0 to 360. Each degree represents a different pure color:

• 0° represents red
• 120° represents green
• 240° represents blue

Saturation describes the intensity or purity of a color and is expressed as a percentage:

• At 0%, the color appears completely desaturated—essentially a shade of gray
• At 100%, the color is at its most vivid and vibrant

Lightness indicates how light or dark a color is, also expressed as a percentage:

• 0% lightness results in black
• 100% lightness results in white

Using Warm Colors in Interior Design

Warm hues—such as reds, oranges, yellows, warm beiges, and greiges—are excellent choices for creating inviting and energetic spaces. These colors are particularly well-suited for:

• Kitchens, living rooms, and bathrooms, where warmth enhances comfort and sociability
• Large rooms, where warm tones can help reduce the sense of emptiness and make the space feel more intimate

For example:

• Warm beige shades provide a cozy, inviting atmosphere, ideal for living rooms, bedrooms, and hallways.
• Warm greige (a mix of beige and gray) offers the warmth of beige with the modern appeal of gray, making it a versatile backdrop for dining areas, bedrooms, and living spaces.

However, be mindful when using warm light tones in rooms with limited natural light. These shades may appear muted or even take on an unpleasant yellowish tint. To avoid a dull or flat appearance:

• Add depth by incorporating richer tones like deep greens, charcoal, or chocolate brown
• Use textured elements such as curtains, rugs, or cushions to bring dimension to the space

Pro Tip: Achieving Harmony with Warm and Cool Color Balance

To create a well-balanced and visually interesting interior, mix warm and cool tones strategically. This contrast adds depth and harmony to your design.

• If your walls feature warm hues, introduce cool-colored accents such as blue or green furniture, artwork, or accessories to create contrast.
• For a polished look, consider using a complementary color scheme, which pairs colors opposite each other on the color wheel (e.g., red with green, orange with blue).

This thoughtful mix not only enhances visual appeal but also creates a space that feels both dynamic and cohesive.

Light Temperature Affects on Onyx

Natural Light

Natural daylight changes in color temperature as the sun moves across the sky. At sunrise and sunset, the light tends to have a warm, golden tone with a color temperature around 2000 Kelvin (K). As the day progresses and the sun rises higher, the light becomes cooler and more neutral. Around midday, especially when the sky is clear, natural light typically reaches its peak brightness and shifts to a cooler tone, ranging from 5500 to 6500 Kelvin. This midday light is close to what we perceive as pure white or daylight-balanced light.

These shifts in natural light can significantly influence how colors appear in a space, which is why designers often consider both the time of day and the orientation of windows when planning interior color schemes.

Artificial Light

When choosing artificial lighting, pay close attention to the color temperature, measured in Kelvin (K). This determines how warm or cool the light will appear. Lower temperatures, around 2700K, give off a warm, yellow glow often used in living rooms or bedrooms. Higher temperatures, above 5000K, create a cool, bluish light similar to daylight, commonly used in kitchens, offices, or task areas.

Use the slider to see how lighting temperature can affect the appearance of a surface or color throughout a space.

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LRV of Onyx

The Light Reflectance Value (LRV) of Onyx is 4.99%, which places it in the Dark colors category. This means it does not reflect light. Understanding a paint’s LRV is crucial for predicting how it will look in your space. A higher LRV indicates a lighter color that reflects more light, making rooms feel larger and brighter. A lower LRV signifies a darker color that absorbs more light, creating a cozier, more intimate atmosphere. Always consider the natural and artificial lighting in your room when selecting a paint color based on its LRV.

Detailed Review of  Onyx

Onyx is a standout choice for anyone looking to make a bold statement in their home. Its dark hue can lend a dramatic flair to a space, making it perfect for accent walls or even full room applications in larger areas. The color’s versatility shines through, as it can effortlessly transition from modern minimalism to rustic charm. When applied, Onyx maintains a sophisticated matte finish that hides imperfections well and offers a sleek look. However, a word of caution: its darker tone can absorb light, so in smaller or dimly lit spaces, it might feel a bit enclosed. Overall, Onyx is a fantastic choice if you’re aiming for a chic, moody atmosphere.

Pros & Cons of  2133-10 Onyx

Colors that go with Benjamin Moore Onyx

FAQ on 2133-10 Onyx

Is Onyx suitable for small rooms?

While Onyx can create a stunning look in smaller rooms, it’s essential to consider the lighting. Its dark tone can make a space feel more enclosed, so it’s best used in well-lit areas or as an accent rather than a primary wall color in tight spaces. Pairing it with lighter decor and furnishings can help balance its depth.

What kind of finish should I use with Onyx?

Onyx works well in a matte or satin finish, which enhances its luxurious feel and helps hide imperfections. If you’re using it in high-traffic areas or on trim, a semi-gloss finish can provide added durability and make it easier to clean.

Comparisons Onyx with other colors

Official Page of Benjamin Moore Onyx 2133-10