The two primary methods for adding lettering and artwork to granite monuments are sandblasting and laser engraving. Each has distinct characteristics, cost profiles, and appropriate use cases. Understanding both helps you advise clients and suppliers effectively.
Sandblasting — properly called abrasive blasting — involves covering the granite surface with a rubber or vinyl stencil, then blasting the exposed areas with high-pressure aluminum oxide or silicon carbide grit. The abrasive removes material from the granite surface, creating a recessed, frosted letter or image against the polished background. The depth of the carving is controlled by blast time, grit size, and pressure. Deep-relief carving (sometimes called V-carve or sculpture) achieves depths of 1/4 inch or more and creates dramatic shadows that are highly readable from a distance. Standard letter depth is typically 3/16 to 1/4 inch for upright monuments.
Sandblasted lettering on polished black granite creates the highest contrast result: the frosted, gray-white carved surface against the deep black polished background. This is the classic monument look — it is highly readable in all lighting conditions, holds up extremely well to weathering over decades, and ages gracefully. Sandblasting can also produce detailed portrait-style artwork, decorative borders, and scenic imagery, though the level of detail is limited by the stencil production process.
Laser engraving uses a high-powered CO2 or fiber laser to vaporize a thin layer of the granite surface. The laser can reproduce photographic-level detail — actual photographs, fine-line artwork, and complex graphics that would be impossible to achieve with sandblasting. Laser engraving is shallower than sandblasting, typically only 0.005 to 0.020 inches deep. The contrast on black granite is excellent because the laser removes the polished surface to reveal the lighter subsurface, similar to sandblasting but at finer resolution.
On lighter granite colors — India Red, Balmoral Red, or Colonial White — laser engraving produces less contrast than sandblasting because the differential between the polished and engraved surfaces is smaller. On these lighter stones, paint-filled sandblasted lettering typically produces better readability. Laser engraving is most effective on black or very dark granites where contrast is naturally high.
Cost differences are meaningful. Sandblasting requires stencil production (either hand-cut vinyl or computer-cut from a digital file), blasting equipment and media, and skilled operator time. For standard text, sandblasting is cost-effective and prices per letter or per line are well-established in the industry. Laser engraving equipment is expensive, so most dealers outsource this work to engraving shops or monument manufacturers with laser capability. Pricing for laser work is typically per square inch of engraved area.
For most standard monument orders — name, dates, and perhaps a simple floral or religious motif — sandblasting is the industry standard and appropriate choice. For portrait photographs, intricate custom artwork, or when a family specifically wants photo-quality imagery on the monument, laser engraving is the superior method. Many finished monuments combine both techniques: sandblasted text for name and dates, laser engraving for a portrait photo. This approach provides the best of both methods.