A Black Quartz Undermount Sink for Granite, Quartz, and Solid Surface Countertops

The Karran QU-720-BL is a 50/50 double-bowl undermount kitchen sink in a deep matte black quartz composite, designed to mount beneath granite, quartz, or solid surface countertops and anchor the visual weight of a darker or high-contrast kitchen design.

Key Features

• Equal 50/50 double bowl with two identically sized basins, each 9 inches deep, for separating washing and rinsing tasks.
• Quartz composite construction with a dense, matte black surface that suits a wide range of kitchen styles.
• Undermount installation into granite, quartz, or solid surface countertops for a flush, seamless counter edge.
• cUPC and IAPMO certified for plumbing code compliance across North America.
• 3-1/2 inch drain openings in each bowl, sized for standard basket strainers or disposal flanges.
• Requires a minimum 36-inch base cabinet to support the 33-1/2 inch overall width.

Two Equal Bowls, One Clean Counter Edge

Both basins are 9 inches deep and equally sized, so neither side feels like the leftover half of the sink. One side can hold a soaking pot while the other stays open for rinsing produce or prepping ingredients. Because it undermounts, the countertop surface runs directly to the bowl edge with no lip or rim on top, making it easy to sweep water and crumbs straight into the basin and keeping the counter looking uninterrupted from front to back.

Quartz Composite in a Matte Black Finish

The sink body is quartz composite, a dense engineered material that gives the basin a consistent black color throughout and a smooth matte surface that holds up to everyday kitchen use. The matte finish diffuses light evenly so it avoids the fingerprint-and-water-spot visibility that polished black surfaces tend to show. At 33-1/2 inches wide and 20-1/2 inches front to back, this is a full-size kitchen sink that fills a standard 36-inch cabinet bay without leaving gaps at the sides.

Where This Sink Fits Best

This sink works best as the primary kitchen basin in a new build or full remodel where the countertop is being fabricated fresh. Undermount installation requires a countertop that supports it, and the sink is rated for granite, quartz, and solid surface. It is a natural fit in kitchens built around two-tone or high-contrast palettes, where dark cabinetry, black fixtures, and stone or quartz countertops are all in play. Designers and cabinet shops specifying a full black-fixture package, including faucets, pulls, and hardware, can use this sink as the anchor of that scheme. Confirm the base cabinet is set up for a 36-inch minimum width and that the countertop fabricator is aware of the undermount before templating.

Common Questions

A Sink That Earns Its Place in a Dark-Fixture Kitchen

For a kitchen designed around black fixtures and stone or quartz countertops, this sink brings the function of a full-size double bowl and the finished look of a true undermount, all in a quartz composite black that stays consistent from bowl edge to basin floor.