Exposed aggregate pool finish is an interior pool surface made of natural aggregate (colored quartz or selected pebble) set in polymer-modified or fortified Portland cement, then washed during application to expose the aggregate at the surface. It is the most durable category of residential pool finish, with a 20+ year typical lifespan and the highest fade resistance available, which is why it is the standard for premium poolscapes across South Florida. Diamond Brite® is the original exposed aggregate pool finish, introduced by SGM in 1978.

This explainer is part of the homeowner’s guide to pool finishes.

What is exposed aggregate pool finish made of?

Exposed aggregate combines natural aggregate with a reinforced cement matrix. Diamond Brite® uses natural colored quartz aggregate, while River Rok® uses selected natural pebble. In both cases the aggregate is bonded in polymer-modified or fortified Portland cement, which is stronger and more chemical-resistant than the basic cement used in traditional plaster.

How is exposed aggregate installed?

The material is mixed on site to specification, then troweled into the prepared pool shell by a factory trained applicator. At precisely the right moment, the surface is washed to remove the top layer of cement and expose the aggregate beneath. Timing is critical. Wash too early and the aggregate loosens, too late and it stays buried. This is exactly why applicator workmanship is non-negotiable for an exposed aggregate finish.

Why does exposed aggregate last longer than plaster?

In an exposed aggregate finish, the aggregate carries the wear rather than the cement matrix. Natural quartz and pebble are durable and color-stable by nature, and the reinforced cement that binds them resists etching better than plain plaster. The result is a surface that holds both its integrity and its color for 20 years or more.

What does exposed aggregate feel like underfoot?

The surface is slightly textured rather than slick, which gives it good slip resistance. It is not sharp. Homeowners who want a smoother feel often look at polished finishes like Ultra Pearl Brite™, which trade some texture for a very smooth surface while keeping aggregate-level durability.

How does Diamond Brite® differ from other exposed aggregate finishes?

Diamond Brite® is the original exposed aggregate pool finish, manufactured by SGM since 1978. It is made with natural colored quartz aggregate in polymer-modified cement. The premium Jewels line, which includes colors such as Tanzanite, Obsidian, and Paraiba, is formulated for unparalleled fade resistance. Authenticity is verified by batch number, and homeowners should be cautious of counterfeit or substituted product sold as the real thing.

How does River Rok® differ from Diamond Brite®?

River Rok® uses selected natural pebble aggregate in fortified Portland cement and is positioned around unparalleled durability and infinite beauty. The pebble aggregate is larger than the quartz in Diamond Brite®, which gives River Rok® more visual variation and a more organic look. As with any aggregate finish, the final color will vary with water depth, surrounding landscaping, and lighting.

Frequently Asked Questions

Is exposed aggregate the same as pebble finish?

Pebble finish is one form of exposed aggregate. Exposed aggregate also includes quartz-based finishes. Both share the same washed-to-expose installation method.

Is exposed aggregate slippery?

No. The exposed aggregate gives the surface a slight texture that improves slip resistance compared with very smooth finishes.

Why does exposed aggregate cost more than plaster?

The materials are higher grade and the installation demands more skill, particularly the timed wash. The payoff is a 20+ year lifespan and the highest fade resistance in the category.

Are all Diamond Brite® colors equally fade resistant?

All Diamond Brite® colors are formulated for strong fade resistance, and the premium Jewels line is specifically engineered for unparalleled fade resistance. Authentic, batch-numbered material is what guarantees you are getting the certified formulation.

Compare it directly in plaster vs quartz vs pebble pool finish, or see why pool finishes fade or discolor.