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There is a precision artistry that goes into making each and every one of my knives. I only use the most unique material (also known as “scale material”) which makes these custom knives different from others you may find. If it does not have a high "wow" factor I won't incorporate it into my art. 

For example, I use gem quality dinosaur bone (fossilized dinosaur bone over 100 million years old that has agatized cell structure). There is a very limited supply of this material which is highly sought after worldwide. It has gone up dramatically in value in recent years, due to its rarity. Most dinosaur bone that is found is of lower quality and would not meet Feldman Custom Knives standards. 

Another example of a coveted materials that we implement in our knife construction is mammoth tusk and Mammoth tooth. There is also a very limited supply of these precious materials and it’s only getting harder to find. Our mammoth tusks and teeth can be anywhere from 8,000 to 50,000 years old and each piece is different in color and texture. No two are identical. We will sometimes dye the tooth to accentuate the amazing patterns and contrasts since the tooth is a cross cut of the original material.

Just a few more of the rare and fine materials that you may find in my knives:

Fossilized dinosaur dung (known as coprolite)
Laguna Lace Agate, Plume Agate, Kaleidoscope Agate...
Several types of unusual Jaspers
Kingman Arizona Turquoise

While the crafted knives are beautiful on their own, the accents that are added only highlight the material that was used as the base for these works of art. 

I have been known to use intricate wooden guitar purling, brass, copper and stainless steel as accent materials on an completed knife.

Below you’ll find a more in-depth description of the rare and unique materials listed above that are used at Feldman Custom Knives.

Gem Quality Dinosaur Bone (aka Gembone)

Gembone is mineralized Dinosaur bone, which has had the individual cell cavities fossilized with precious minerals. It is one of three gemstones created from organisms (the others being Pearl and Ammolite). Many minerals can be found in Gembone including hematite, iron, pyrite, jasper, marcasite, agate, quartz or other crystal. Dinosaur bone is rare enough but Gembone accounts for only a small fraction of the total Dinosaur bone that is unearthed. It only occurs in a very limited amount of locations in the world where the conditions were just right. I have selected Dinosaur Gembone as one of my scale materials due to its beauty and rarity. The day will come when I will not be able to find this rarest of fine materials. Coveted by collectors around the world, I am proud to present Gembone in my knives.

Coprolite (Fossilized Dinosaur Dung)

A coprolite is fossilized poop. Coprolites are classified as trace fossils as opposed to body fossils, as they give evidence for the animal's behavior (in this case, diet) rather than morphology. They serve a valuable purpose in paleontology because they provide direct evidence of the predation and diet of extinct organisms. Like Gembone they can become agatized with many of the same minerals and this process only took place in a limited amount of locations on earth. I have selected Coprolite as one of my scale materials due to the uniqueness and wild beauty of this ancient material.

Mammoth Tusk

Mammoth tusk/ivory can range from 8000 to 50,000 years old and is found preserved to different degrees in the permafrost. Eskimos looking for a meal might find one, bush pilots could spot one while flying low and occasionally miners find these coveted prizes. Mammoths are larger than today's modern elephant and their tusks are much heavier and longer as well than their modern cousins. These amazing creatures died out due to drastic climate change but some of their beauty lives on in the exquisite hues of brown, blue, and tan which are created by thousands of years of mineralization. Each tusk holds patterns and color combinations that are as unique as a fingerprint. Its beauty can be permanently captured in the scales on your hand made custom knife. Mammoth tusk is getting harder and harder to find and someday may fade away as a scale making material due to how rare it is.

Mammoth Tooth

Mammoth tooth is found in the same places as mammoth tusk/ivory, and is subject to similar scarcity and preservation concerns.  Mammoth tooth can be sectioned in several ways when producing knife scales, revealing intricate patterns and colors.


Agate is a cryptocrystalline variety of silica, chiefly chalcedony, characterized by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. Agates vary widely in their patterns, colors, vibrancy and shapes. I hand select only the finest of agates for my knife scales.  If it is mediocre you will not find it on one of my knives.


Jasper, an aggregate of microquartz and/or chalcedony and other mineral phazes, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron inclusions. Jasper is found all over the world but I hand pick only the finest, most beautiful and interesting examples of this amazing knife making material.


Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminum. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. I mostly use fine turquoise from the prized Kingman mine which color is exactly as it was when it was unearthed but its structure has been stabilized to help keep the turquoise strong and together. The dazzling beauty is captured in the scales of my finely crafted knives.