How to Identify Koa
Recognize Koa by its golden-to-red-brown color, shimmering curly chatoyant figure, high luster, and medium weight — and tell it from mango and acacia.
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Start with color and figure together, because on figured stock they are nearly diagnostic. Koa's heartwood runs from golden and honey-brown through warm red-brown to darker chocolate, often with streaks and banding, and the surrounding sapwood is a sharply paler whitish-yellow. The signature clue is chatoyancy: on curly or fiddleback boards the surface appears to shift and glow as you tilt it under light, thanks to wavy interlocked grain and the wood's high natural luster. If a warm reddish-brown hardwood board seems to have bands of moving light across its face, Koa is a strong candidate.
Assess weight and hardness. Koa is a medium-density wood — noticeably heavier than mahogany or cedar but not as heavy as oak or hard maple — and a Janka around 1,170 lbf means a fingernail will not easily mark it. That medium heft helps separate it from lighter tropical look-alikes and from softwoods that may share a reddish tone.
Look at the grain and end grain. Koa is diffuse-porous, so on the end grain the pores are fairly evenly distributed with no ring of large early-wood pores; the pores are medium-sized and often visible. The face grain is straight to strongly wavy or interlocked, and it is that interlock, not any bold ray fleck, that produces the figure — Koa does not show the prominent rays of oak or sycamore. The wood has little to no distinctive scent when worked, which helps rule out aromatic woods.
The most common confusions are with other members of its own group and with mango. Australian blackwood (Acacia melanoxylon) is a very close relative that looks almost identical — figured, golden to red-brown, chatoyant — and is genuinely hard to distinguish by eye; provenance is often the deciding factor, with true Koa coming only from Hawai'i. Mango (Mangifera indica) can mimic Koa's color and curl but tends to be lighter, softer, more prone to spalting and streaking, and often shows more variable, greener or greyer tones. Genuine and 'African' mahogany share the reddish-brown color but are typically more uniform, lack Koa's intense curl, and show a more pronounced ribbon stripe rather than chatoyant curl. Because Koa closely resembles its relatives, a confident call often rests on the combination of strong chatoyant curl, warm island-red color, medium weight, and documented Hawaiian origin.
Frequently asked questions
What is the quickest way to spot Koa?
Tilt a figured board under light. Koa's warm golden-red heartwood combined with strong chatoyant curl that seems to shift and glow is its most telling trait, especially alongside its high natural luster and medium weight.
How do I tell Koa from mango?
Mango tends to be lighter and softer than Koa, with more variable coloring and greener or greyer tones, and it spalts and streaks more readily. Koa is denser, warmer and redder overall, and its curly figure typically reads more uniform and luminous.
Can Koa be told apart from Australian blackwood?
Not reliably by appearance alone — Australian blackwood (*Acacia melanoxylon*) is a close relative and looks nearly identical when figured. Documented origin is usually the deciding factor, since true Koa comes only from the Hawaiian Islands.
Does Koa have a distinctive smell?
No. Freshly worked Koa has little to no characteristic odor, which helps separate it from scented tropical woods. Identification relies instead on its color, chatoyant curly figure, luster, and medium weight.
Koa identified by the community
Recent Koa samples identified with Wood Identifier.
