Does Moissanite Tarnish or Change Color? The Complete Answer

September 15, 2026

One of the most common questions about moissanite is whether it tarnishes, changes color, or loses its brilliance over time. The short answer is no — but the full answer requires understanding exactly what moissanite is made of, how it interacts with its environment, and what can create the temporary appearance of dullness that is sometimes mistaken for color change.

Does Moissanite Tarnish?

No. Moissanite does not tarnish.

Tarnishing is a chemical reaction that occurs when metal oxides on a surface react with sulfur compounds, moisture, or oxygen in the air. Sterling silver, certain gold alloys, and brass all tarnish over time. Moissanite is silicon carbide (SiC) — a compound that is chemically inert under all normal everyday conditions. It does not oxidize, does not react with household chemicals in normal concentrations, and does not tarnish.

The silicon carbide crystal structure that gives moissanite its hardness (9.25 on the Mohs scale) also gives it exceptional chemical stability. It will not tarnish in 5 years, 50 years, or 500 years.

Does Moissanite Change Color?

No. Moissanite does not change color.

The color of a gemstone is determined by its crystal structure and the trace elements within it. Moissanite's color is set at the atomic level during its formation — it cannot be altered by heat, light exposure, chemicals, or time under normal everyday conditions.

A D-color moissanite (colorless) will remain colorless indefinitely. A near-colorless moissanite will retain its grade. Neither will shift toward yellow, grey, or any other color through normal wear.

Why Does My Moissanite Look Dull or Different?

If your moissanite appears less brilliant, "foggy," or different in color, the cause is almost always surface contamination rather than any change to the stone itself. Common culprits:

Lotions and Oils

Skin lotion, sunscreen, and natural skin oils deposit a thin film on the back of the stone (the pavilion). This film blocks light from entering and reflecting through the stone — which is what creates brilliance. The stone is not changing; its surface is obscured. A 30-second clean with warm water and dish soap restores full brilliance immediately.

Soap Residue

Paradoxically, soap residue from handwashing can dull moissanite if the ring is not rinsed thoroughly after washing hands. Soap film behaves similarly to lotion — it coats the stone's facets and reduces light return.

Hard Water Deposits

In areas with hard water (high mineral content), water deposits can build up on the stone over time, creating a cloudy or dull appearance. Regular cleaning removes these deposits completely.

Lighting Conditions

Moissanite looks dramatically different in different lighting environments. In warm indoor light (incandescent or LED), the stone's fire (colored light flashes) may be more prominent. In cool fluorescent light, the stone may look less brilliant. This is not the stone changing — it is the stone responding to its light environment, exactly as it is supposed to.

What About the Metal Setting?

While moissanite itself does not tarnish, the metal setting can show signs of wear over time:

White gold: Rhodium plating on white gold can wear thin over 1–2 years of daily wear, revealing a slightly yellowish or warmer color underneath. Re-plating is a simple, inexpensive jeweler service that restores the original appearance.
Yellow and rose gold: Gold alloys do not tarnish under normal conditions. They may develop minor surface scratches over time (a normal patina) but will not change color.
Platinum: Develops a natural patina over time. This is a surface texture change, not a color change, and is considered desirable by many. It can be polished off if preferred.

How to Keep Moissanite Looking Its Best

Clean weekly with warm water, one drop of dish soap, and a soft toothbrush.
Apply lotions and sunscreen before putting on jewelry.
Remove for heavy cleaning, gardening, and chemical exposure.
Have white gold settings re-plated every 1–2 years as needed.
Annual professional inspection and ultrasonic cleaning (optional but recommended).

Full care and cleaning guide here.

🛡️ Lifetime Gemstone Warranty — Your moissanite is guaranteed forever.
💍 Shop Moissanite Rings