Ruby Jewellery Care: Check Treatments Before Cleaning
At a glance
Ruby can be a durable jewellery stone, but its treatment history matters. Fracture-filled, cavity-filled or dyed ruby needs gentler care than untreated material. Establish the treatment and condition before choosing a cleaning method.
How durable is ruby?
Ruby is corundum, with Mohs hardness 9 and excellent toughness in material without treatment-related concerns. That makes it a useful jewellery gem, but a hardness figure does not cancel out the effects of fractures, fillings or an insecure setting.
Can ruby go in an ultrasonic cleaner?
GIA says ultrasonic and steam cleaning are usually safe for untreated, heat-treated and lattice-diffusion-treated ruby. It specifically advises a damp cloth only for fracture-filled, cavity-filled or dyed material. Do not use the general rule until you know which category applies.
Why do filled rubies need extra care?
Some rubies have surface-reaching fractures filled with glass. Chemicals can affect this filling; GIA notes that even lemon juice may damage high-lead glass fillers. Avoid household cleaning experiments and disclose known treatments before repairs.
What should you ask the seller?
Ask whether the stone is natural or laboratory grown, what treatments are known and what documentation accompanies it. These are separate questions. If the listing does not answer them, request clarification rather than interpreting the word ruby as a complete laboratory description.
What should you bring to a service appointment?
Bring the receipt, product description and any report or treatment disclosure. Describe the problem you want addressed: dirt behind the stone, a loose fastening or a visible change. Ask the jeweller to explain the proposed method before work starts. Keep the service note with your purchase records so the next person handling the piece has the same information.
Sources and further reading
Material facts and care guidance: GIA: Ruby care and cleaning guide. Checked 8 November 2026. Practical shopping checklists are Kaedesigns editorial guidance; they do not certify the condition or treatment of a particular item.