"Dymondwood" is yet another brand name for a plastic filled laminated wood.
Thin sheets of wood are impregnated with a resin, stacked, then subjected to high heat and extreme pressure to bond it into a solid mass.
There are a number of trade names used by various companies including "Pakkawood" and several others.
It's an extremely durable, attractive material, that gives a better appearance the more it's shaped and contoured.
It's great for pistol and knife handles, but too heavy for most long gun stocks.
Depending on the company making it, it's available in sheets of as much as 4' by 8', and in thicknesses up to 4" and possibly even more.
There are many color combinations. One of the most unusual I ever saw was a set of European-type target pistol grips made from contrasting Burgundy colors with a layer of a golden-white wood.
This made the grips appear to have a gold stripe running through it.