Benjamin Moore Onyx (BM 2133-10): Pros, Cons, and Thoughts

Benjamin Moore Onyx is a paint color that is all about sophistication and modernity.

As a rich, deep black with subtle undertones, it has gained a reputation for being one of the most versatile dark shades available.

Whether you’re looking to make a bold statement with accent walls, add drama to cabinetry, or create a striking exterior, Onyx offers endless possibilities.

In this guide, we’ll explore everything you need to know about Benjamin Moore Onyx.

From its undertones and light reflectance value (LRV) to tips for styling and real-world applications, we’ll help you decide if this timeless black is the right choice for your home.

Understanding Benjamin Moore Onyx

1. What Is Onyx 2133-10?

Benjamin Moore Onyx is a rich, pure black that strikes a delicate balance between depth and softness.

Unlike other blacks that may lean overly harsh or cool, Onyx maintains a sense of elegance that makes it suitable for a variety of settings.

• Category: A neutral black.
• Versatility: Works in both modern and classic interiors.
• Finish Options: Looks stunning in matte for walls and satin or gloss for trim and cabinetry.

I remember using Onyx for a home office wall once. It completely transformed the space, making it feel cozy yet professional.

The richness of the color almost gave the room a tailored suit vibe—sharp, polished, and undeniably chic.

2. Light Reflectance Value (LRV) and Its Impact

The LRV of Benjamin Moore Onyx is 4.99, meaning it absorbs most light and reflects very little. This characteristic gives it that bold and dramatic appearance.

• Why it matters: Lower LRV colors like Onyx create a striking effect, but they can make spaces feel smaller if not balanced with lighter elements.
• Best uses: Onyx works beautifully in rooms with plenty of natural light or when paired with reflective surfaces like mirrors or metallic accents.

3. Undertones of Onyx

One of the reasons Onyx is so beloved is its neutrality. While it doesn’t carry strong undertones, you might notice a faint softness in low lighting, keeping it from feeling too stark or harsh.

• Subtle warmth: This helps Onyx pair seamlessly with both warm and cool palettes.
• No heavy blue or green undertones: Makes it a true black that works universally.

Warm vs. Cool Blacks: Where Onyx Stands

Not all blacks are created equal. Some lean warm, with brown or red undertones, while others are distinctly cool with blue or green hints.

• Onyx’s stance: It’s a neutral black, offering a pure, balanced look.
• Where it works: Perfect for those who want the dramatic impact of black without a strong color bias.

For example, I once used Onyx on a fireplace surround in a modern living room.

Paired with crisp white walls and gold accents, it added just the right amount of contrast and sophistication without overpowering the space.

How Lighting Affects Onyx

1. Natural Light Considerations

Lighting can dramatically influence how Onyx appears.

• Bright, natural light: Highlights its true, pure black nature.
• Low natural light: May introduce a softer, muted effect, giving it a cozy appearance.
• North-facing rooms: The cooler light enhances its neutrality.
• South-facing rooms: Adds a slight warmth, keeping it from feeling cold.

2. Artificial Lighting Effects

Artificial lighting also impacts Onyx’s look.

• Warm bulbs: Add a subtle glow, softening its sharpness.
• Cool LED lights: Enhance its depth and neutrality, making it appear darker and more dramatic.

Comparing Onyx to Other Popular Blacks

1. Onyx vs. Black Magic

• Onyx: Pure and neutral, with no overpowering undertones.
• Black Magic: Slightly warmer, with subtle brown undertones.
• Best for: Onyx suits modern, crisp aesthetics, while Black Magic works better in traditional or warm-toned spaces.

2. Onyx vs. Wrought Iron

• Onyx: True black with a clean finish.
• Wrought Iron: A softer black with hints of gray, offering a less dramatic alternative.
• Best for: Wrought Iron is ideal for interiors that want the depth of black without the intensity, while Onyx is perfect for statement pieces.

3. Comparison Chart

Paint Color	Undertone	LRV	Best Use
Onyx	Neutral Black	4.99	Accent walls, trim, cabinetry
Black Magic	Warm Black	3.0	Traditional interiors
Wrought Iron	Grayish Black	6.16	Subtle, soft black accents

Using Onyx in Interior Spaces

1. Living Rooms

Onyx is perfect for creating drama in living rooms.

Use it for accent walls or as a backdrop for artwork.

Pair it with soft furnishings and metallic accents for a luxurious feel.

2. Kitchens

Onyx cabinetry adds sophistication and works well with white countertops or brass hardware.

3. Bedrooms

For a cozy and moody bedroom, Onyx can be used on all walls. Add light-colored bedding and textured decor for balance.

4. Bathrooms

Black bathrooms are trending, and Onyx is a fantastic choice for walls or vanities. Use marble or lighter tiles to avoid the space feeling too heavy.

Trim and Accent Colors That Pair with Onyx

1. Best Trim Colors

• White Dove (Benjamin Moore): A soft white that contrasts beautifully.
• Simply White (Benjamin Moore): For a crisp, clean look.

2. Complementary Accent Colors

• Gold or brass tones: Add warmth and elegance.
• Deep greens or burgundies: For a bold, dramatic look.
• Neutral grays: Keep the palette subtle and modern.

Practical Tips for Choosing and Using Onyx

• Test before you commit: Paint swatches on different walls and observe them at various times of the day.
• Pair with natural textures: Wood, stone, or leather bring balance to Onyx’s depth.
• Mind the lighting: Ensure the room has sufficient light to prevent the space from feeling too enclosed.
• Use Reflective Finishes: If you’re concerned about Onyx making a room feel too heavy, choose glossy or satin finishes to reflect light and add a sense of openness.
• Balance with Neutrals: Offset Onyx with light and neutral tones like whites, creams, or soft grays. This contrast prevents the space from feeling too intense and adds visual interest.
• Limit Use in Small Spaces: While Onyx can work in small rooms, it’s best used as an accent rather than a primary wall color. Alternatively, pair it with large mirrors to create the illusion of space.
• Accent Statement Walls: Use Onyx on a single wall in living rooms or bedrooms to create a focal point. This works especially well behind a bed, fireplace, or artwork.
• Layer with Metallic Accents: Incorporate gold, brass, or silver decor items to add warmth and sophistication to the bold black backdrop.
• Combine with Bold Colors: For a dramatic aesthetic, pair Onyx with deep jewel tones like emerald green, sapphire blue, or ruby red. These colors create a luxurious and modern vibe.
• Highlight Architectural Details: Use Onyx on trims, moldings, or doors to highlight unique architectural features without overwhelming the space.
• Experiment with Ceiling Applications: For rooms with high ceilings, Onyx can add a dramatic, cozy effect. Pair it with lighter walls to maintain balance.
• Perfect for Exteriors: Onyx makes an excellent choice for shutters, front doors, or window frames. The rich black contrasts beautifully with lighter exterior walls.
• Consider Complementary Colors: Pair Onyx with Benjamin Moore’s Simply White or Chantilly Lace for a clean, striking combination that highlights its richness.
• Blend with Matte Finishes: Use a matte finish for walls to create a velvety, sophisticated appearance. This is particularly effective in modern or minimalist designs.
• Avoid Overuse: While Onyx is versatile, overusing it in a single space can make the area feel overwhelming. Balance it with lighter shades or pops of color.
• Coordinate with Furniture and Decor: Ensure your furniture complements the depth of Onyx. Lighter upholstery, patterned rugs, or textured throw pillows can add contrast and softness.

Conclusion

Benjamin Moore Onyx (2133-10) is a timeless, versatile black that elevates any space with its rich, neutral depth.

From interiors to exteriors, accent walls to cabinetry, it’s a sophisticated choice that adapts seamlessly to different styles and settings.

Whether you’re going for bold, modern drama or subtle elegance, Onyx is a paint color you can count on to deliver exceptional results.

Ready to transform your space with the power of black? Give Benjamin Moore Onyx a try—you won’t regret it!