Design and analysis software
GemRay
Ray-tracing renderer that models the optical performance of a faceted design before it is cut.
The record
Kind of equipmentDesign and analysis software
PlatformWindows
Price, as listedThe site states GemRay is now free.
StatusTrading
What it makes
Named as the maker names them on its own site. Specifications and availability change; confirm with the maker before ordering.
GemRay for Windows
Worth knowing
Also by Robert W. Strickland and distributed from the same site as GemCad. The vendor states GemRay is written in C++ and is now open source, with the source available on request. The stated requirement is Windows XP or later; an older DOS build is the engine that third-party optimisers call.
Compiled from gemcad.com, read on August 16, 2026.
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