How can you tell if jewellery has porosity?

Visible surface pitting on the metal is one sign, though internal porosity may not show on the outside at all. A jeweller can sometimes detect it when polishing or re-tipping, and it shows clearly under a microscope or on an X-ray used for quality inspection.

Is porosity dangerous in a ring?

Severe porosity can make a setting weak enough that a stone falls out, or a band cracks under impact. Mild cases may never cause practical problems, but any piece with notable surface porosity is worth having assessed by a jeweller before buying or wearing.

Can porosity be repaired?

Minor surface porosity can sometimes be filled during polishing, but deep internal voids are difficult to address without recasting the piece. A jeweller who identifies significant porosity in a new piece should replace it rather than attempt repairs.

What is porosity in jewellery metal?

By Jared James · Last updated 21 May 2026

Definition

Porosity in jewellery refers to a manufacturing defect that occurs during casting, when air or gas bubbles become trapped inside the metal as it cools and solidifies. These pockets of air weaken the structural integrity of the piece, making it more prone to cracking and damage under everyday stress. In mild cases, porosity is invisible from the outside, but severe porosity can cause tiny pits on the metal surface and the piece may eventually fail at those weak points. It is a quality issue that better casting techniques and temperature control can prevent.

Frequently asked questions

How can you tell if jewellery has porosity?: Visible surface pitting on the metal is one sign, though internal porosity may not show on the outside at all. A jeweller can sometimes detect it when polishing or re-tipping, and it shows clearly under a microscope or on an X-ray used for quality inspection.
Is porosity dangerous in a ring?: Severe porosity can make a setting weak enough that a stone falls out, or a band cracks under impact. Mild cases may never cause practical problems, but any piece with notable surface porosity is worth having assessed by a jeweller before buying or wearing.
Can porosity be repaired?: Minor surface porosity can sometimes be filled during polishing, but deep internal voids are difficult to address without recasting the piece. A jeweller who identifies significant porosity in a new piece should replace it rather than attempt repairs.

Designing a ring

Talk through porosity with us

Tell us what you have in mind, even if it is only a budget and a piece of jewellery type, and we will help you weigh up the options. We reply to every enquiry, usually within one business day.

Contact the studio