GRISUN Onyx Black Fire Glass Diamonds 1" 20 lb – Reflective Tempered Glass for Fire Pits & Fireplaces

GRISUN Onyx Black Fire Glass Diamonds are 1-inch reflective black glass pieces sold in a 20-pound bag to upgrade gas, propane, or electric fireplaces and outdoor fire pits with a modern, low-maintenance finish.

These Onyx Black fire glass diamonds give your fire feature a sleek, contemporary look while reflecting flame and light for dramatic visual depth. Made to resist heat, corrosion, and fading, the tempered glass replaces wood or lava rock in compatible gas and electric fire appliances, producing no smoke or lingering odors. The dark mirror-like finish enhances flame color and creates a lasting decorative base that’s easy to arrange and maintain.

How will this fire glass change the look of my fire pit or fireplace?

Onyx Black pieces create a clean, minimalist backdrop that intensifies flame contrast and adds shimmer from every angle. The mirror-like faces reflect both natural and artificial light, giving a sense of movement and greater flame presence without needing more fuel.

• Deep black finish increases perceived flame brightness and depth
• Reflective surfaces bounce light for a glossy, modern appearance
• Uniform 1-inch diamonds create a consistent, contemporary bed
• 20 lb supply covers a variety of burner sizes depending on layout

Will these glass diamonds work with my gas or electric system?

Yes — GRISUN Onyx Black Fire Glass Diamonds are suitable for propane, natural gas, and electric fireplaces and fire tables when used as directed by the appliance manufacturer. They are not combustible and will not melt under normal appliance temperatures, making them a safe decorative option for approved systems.

• Compatible with propane and natural gas burners
• Safe for use in indoor glass fireplaces and outdoor fire pits rated for glass
• Not intended for direct contact with open wood flames in wood-burning pits
• Follow appliance guidelines for depth and coverage over the burner

How durable and low-maintenance is this fire glass?

The tempered glass resists fading, corrosion, and heat-related damage, so it keeps its shine through seasons of use. Unlike wood or stone, it won’t produce ash or creosote and requires only occasional rinsing or brushing to remove dust and soot buildup.

• Heat-resistant glass that retains reflective finish
• Doesn’t emit fumes or unpleasant smells during use
• Simple cleaning: rinse with water and air-dry, no special chemicals
• Maintains color and shine longer than many decorative media

How much coverage does a 20-pound bag provide?

A 20-pound supply of 1-inch diamonds is suitable for small-to-medium burners or as a top layer for larger installations; coverage varies by burn pattern and desired depth. For a shallow aesthetic, the bag can dress most residential fire tables; for full coverage on larger pits you may need multiple bags to reach recommended depths over the burner.

• Estimated coverage depends on burner width and desired glass depth
• For thin decorative layers, one bag often suffices for compact fire tables
• Deeper beds or wider pits typically require additional 20 lb bags
• Arrange glass evenly to avoid exposing burner elements

Who is this for? GRISUN Onyx Black Fire Glass Diamonds are ideal for homeowners and designers seeking a modern, low-odor, and low-maintenance finish for gas or electric fireplaces, patio fire tables, and decorative indoor glass fireplaces. Choose this 20 lb pack if you want a dramatic black reflective bed that enhances flame visuals, reduces cleanup, and provides a durable decorative option for rated fire appliances.