There is no verified August 2026 industry-wide gem-lab update for jewelry care and cleaning. What is new is maker guidance separating professional cleaning stages and warning against aggressive methods for coated gemstones. The key takeaway is simple: identify the gem and any treatment before choosing water, steam, chemicals, or an ultrasonic cleaner. The most sensitive stone or surface treatment should determine how the entire piece is handled.
Table of Contents
- What the August record actually establishes
- Why ultrasonic and steam cleaners are not interchangeable
- How coatings and treatments change the decision
- Choose the method by stone, not appearance
What the August record actually establishes
Two Stuller maker records dated august 6 and 7, 2026 address professional equipment and coated-gem care. They offer practical workshop guidance, not a universal cleaning standard. The underlying gem-lab advice is older.
GIA's broad jewelry-care guidance remains dated December 10, 2015, while its August-birthstone care page shows no publication date. Readers should therefore treat august 2026 as a maker-guidance update, not evidence that laboratories changed every cleaning recommendation. GIA's established treatment-aware precautions still provide the broader framework.
Why ultrasonic and steam cleaners are not interchangeable
An ultrasonic cleaner uses vibration in liquid to loosen oil and debris. A steam cleaner directs dry steam at jewelry to rinse away remaining residue. Stuller's August 6 equipment guide places these machines at different stages: ultrasonic cleaning before inspection or repair, followed by dry steam as a finishing rinse.
One is not a substitute for the other. That professional sequence does not make either method safe for every piece. GIA warns that ultrasonic vibration can loosen stones or chip girdles—the outer edges of stones—when gems touch. Filled, organic, coated, heat-sensitive, and some heat-treated gems also require different care.
How coatings and treatments change the decision
A coated gemstone has material applied to its surface to alter or improve its appearance. Heat, abrasion, or workshop chemicals can damage that layer even when the gem beneath it appears durable. Stuller's August 7 coated-gem guidance recommends mild detergent, warm water, a soft brush, and a lint-free cloth in most cases.
It advises against steam and ultrasonic cleaning because heat and vibration may compromise the coating. Jewelers should identify a possible coating before cleaning, polishing, repairing, or setting the stone. Owners can also consult a gem report for detectable treatments, since GIA says solvents, heat, steam, and ultrasonics can harm some treated colored gems.
Choose the method by stone, not appearance
For most colored-gem jewelry, GIA's practical baseline is warm water, mild detergent-free dish soap, and a soft brush. Rinsing in a glass instead of directly over a sink reduces the chance of losing a stone that has worked loose. Before cleaning: Similar-looking stones may need different methods. GIA's August-birthstone guidance says peridot should never receive steam or ultrasonic cleaning because it is vulnerable to thermal shock.
Intact spinel can tolerate both, although warm soapy water remains the safer alternative. Pearls require stricter care. GIA says they rank 2.5 on the Mohs hardness scale and must never receive steam or ultrasonic cleaning. Wipe them after wear with a very soft cloth; if strung pearls receive occasional warm soapy water, let the strand dry completely before wearing it.
- Check a gem report for disclosed or detectable treatments.
- Ask a jeweler to inspect settings, especially before ultrasonic cleaning.
- Avoid steam and ultrasonics when the gem or coating is uncertain.
- Use a soft brush and lint-free cloth rather than abrasive tools.
- Let strung jewelry dry fully when moisture could affect the thread.
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