Velvet Opal

Velvet opal is a trade and descriptive name for opal that displays a soft, diffuse, velvety sheen across its surface rather than the bright, distinct flashes of classic precious opal. The effect gives the stone a plush, glowing appearance that some compare to soft fabric.

Most velvet opal is a variety of common opal or low-grade precious opal where the diffracted light is scattered gently. Soft blue and lavender tones are especially popular.

The name is used loosely in the gem trade, so material sold as velvet opal can vary in origin and quality. It is valued mainly for its calm, even glow.

Velvet opal forms by the same process as other opal: silica-rich water deposits microscopic spheres of hydrated silica in cavities and seams within host rock, often volcanic or sedimentary.

The velvety look arises when the internal silica structures scatter light in a diffuse way, or when fine inclusions and slight internal disorder soften any play-of-color into an even sheen. This contrasts with the sharply ordered spheres that create vivid, directional fire.

Low-temperature precipitation over long periods produces the gel-like silica, and minor impurities can lend the soft blue, gray, or lavender body color seen in many velvet opals.

Look for opal showing a smooth, diffuse glow or sheen across the surface rather than crisp, isolated color flashes. Standard opal traits apply: hardness about 5.5-6.5, vitreous to waxy luster, white streak.

Distinguish velvet opal from chalcedony or moonstone by confirming it is opal (softer, water-bearing) and by the diffuse nature of its sheen. Moonstone shows adularescence (a billowy light) in feldspar, while velvet opal is silica.

Because velvet opal is a trade term, check that the stone is genuine opal and not dyed chalcedony or glass, which may feel warmer and show bubbles.

Velvet opal is cut into cabochons, beads, and decorative pieces, valued for its soft, soothing appearance rather than dramatic fire. It appeals to buyers who prefer a subtle, even glow.

It is generally more affordable than top precious opal, though attractive blue and lavender velvet opal can still command good prices. As with all opal, it should be protected from hard knocks and extreme dryness.

Metaphysically, opal is associated with emotional soothing and creativity; the velvet variety is often marketed for calm and gentleness, a traditional rather than scientific claim.