Most gemstone jewelry uses one of three categories: natural untreated, natural treated, or lab-created. Reputable jewelers disclose which is which. Most don't. Here's how to read the labels.
Three categories of 'natural gemstone'
Natural untreated — the stone formed in earth and was cut and polished but otherwise not modified. Color, clarity, and structure are exactly what nature produced. The most expensive category for any given stone variety.
Natural treated — the stone formed in earth but was modified post-mining to enhance color, clarity, or appearance. Common treatments include heat (used on most sapphires, rubies, and amethysts), irradiation (used on most blue topaz and some diamonds), oil-filling (common on emeralds), and surface coatings (mystic topaz, some opals). The treatment is permanent for some, semi-permanent for others.
Lab-created (synthetic) — the stone has the same chemical composition as the natural variety but was grown in a lab rather than in earth. Lab-created stones are physically identical to natural; they differ only in origin. Cubic Zirconia (CZ) is the exception — it's not a synthetic version of a natural stone, it's a different material that imitates diamond visually.
What's in the Just Neat Stuff catalog
Amethyst (Goddess Star, Earrings, Bracelet) — natural amethyst, typically heated to enhance color uniformity. Heating is industry-standard for amethyst and is essentially permanent. Source typically Brazil or Uruguay (the world's largest amethyst-producing regions).
Mystic Topaz (Earrings) — natural topaz with a titanium-vapor-deposition surface coating that creates the rainbow shimmer. The topaz is real natural; the rainbow effect is the surface treatment. The treatment is permanent under normal wear but can be damaged by ultrasonic cleaning, harsh solvents, or very high heat.
Iolite (Earrings) — natural iolite, generally untreated. Iolite is a relatively rare gemstone (also called 'water sapphire') from East Africa, India, and Brazil. The Just Neat Stuff iolite is sourced from the supplier's standard supply chain — typically India.
Garnet (Oval Swirl Earrings) — natural garnet, generally untreated. Garnet is one of the few gemstones rarely subject to treatment.
Sapphire and Rhinestone (Cluster Cocktail Ring) — the sapphire is natural, the rhinestones are lead-glass crystal accents. The product name explicitly distinguishes them.
Cubic Zirconia (Posh Vintage CZ Ring) — explicitly named as CZ. Lab-created cubic zirconia is not a substitute for natural diamond; it's its own optical material with a different refractive index and dispersion.
What disclosure should look like
FTC's Guides for the Jewelry Industry (16 CFR Part 23) require sellers to disclose material treatments at point-of-sale. 'Material' means treatments that significantly alter durability, value, or care requirements. The standard requires:
1. Heat treatment in amethysts/sapphires/rubies — disclosed if asked, typically not labeled 'untreated' (which is allowed only for verified untreated stones)
2. Surface coating treatments (mystic topaz, coated opals) — required to be disclosed at sale
3. Irradiation (blue topaz) — required disclosure
4. Lab-created vs natural — clear naming required ('lab-created sapphire' not just 'sapphire')
Just Neat Stuff product pages list the gem-name and any treatment material in the product description. The standard is met.
Which treatments affect care
Heat-treated amethyst, sapphire, ruby — care identical to natural. Wash gently, avoid harsh chemicals, store separately to prevent scratching.
Mystic topaz and other surface-coated stones — avoid ultrasonic cleaners (the vibration can compromise the coating), avoid alcohol-based jewelry cleaners, avoid prolonged direct UV exposure (the coating can degrade in sunlight over years). Wash with mild soap and water only.
Lab-created stones — care identical to natural counterparts. CZ specifically is durable to ~8.5 on Mohs scale (vs 9 for natural sapphire, 10 for diamond) — scratchable but not delicate.
Shop the gemstone line
Real amethyst, mystic topaz, iolite, garnet in sterling.
Sources & citations
- Federal Trade Commission. "Guides for the Jewelry, Precious Metals, and Pewter Industries" (16 CFR Part 23). ftc.gov/legal-library
- Gemological Institute of America. "Gem Treatments and Disclosure." gia.edu
- American Gem Society. "Member Code of Conduct on Treatment Disclosure." americangemsociety.org
- Schumann, W. (2013). Gemstones of the World. Sterling Publishing. 5th ed.
All Just Neat Stuff
The full Just Neat Stuff catalog at Curated Sense — mystical, celestial, gemstone.
All Just Neat Stuff →Discover more from Just Neat Stuff or browse the full Just Neat Stuff collection.
Frequently asked
What does "What's Real and What's Treated: A Plain Guide to Amethyst, Mystic Topaz, Iolite, and Other Common Gemstones" cover?
This piece walks through the topic, context, and practical implications laid out in the article body above — focused on giving you a clear, sourced read rather than a quick listicle. Use it to deepen your understanding of the brand, category, or product family discussed.
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Open the brand's collection or sub-collection page linked above to see current stock. Each product card opens a full Curated Sense product page with sizing, materials, the maker's own description, and the brand's live shipping policy.
