Cherry Opal Identification Guide
Identify cherry opal by its glowing red-to-orange body color, waxy luster, and low hardness versus carnelian, fire opal, and glass.
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What Cherry Opal Looks Like
Cherry opal is a variety of opal (hydrated silica, SiO₂·nH₂O) with a warm cherry-red, pinkish-red, or red-orange body color, most often as common opal (no play-of-color) though some pieces show flashes. It is typically translucent to semi-transparent with a waxy to glassy (vitreous to resinous) luster. Mexican cherry opal is the best known, ranging from soft watermelon-pink to deep red. The material is smooth and even, sometimes with cloudy or milky zones, and may occur in matrix or as nodules.
Step-by-Step Field ID Checklist
- Color: Confirm a warm cherry-red to red-orange or pink body color.
- Luster and transparency: Look for a waxy to glassy sheen and translucency to light.
- Play-of-color: Tilt the stone; some cherry opal shows green or red flashes, but most is common (no flash).
- Hardness test: It is softer than quartz, around Mohs 5.5–6.5; a quartz point will scratch it.
- Conchoidal fracture: Look for smooth, curved breaks.
- Acid test: No fizz.
Key Diagnostic Tests
- Hardness: Mohs 5.5–6.5; scratched by quartz, unlike carnelian.
- Fracture: Conchoidal.
- Density: Low, ~1.9–2.2 g/cm³, noticeably light in the hand.
- Luster: Waxy/resinous to vitreous.
- Streak: White.
Common Look-Alikes and How to Tell Them Apart
- Carnelian / red chalcedony: Harder (Mohs 7) and denser; cherry opal is softer and lighter, and a quartz point scratches opal but not carnelian.
- Fire opal: Closely related Mexican opal but more orange; cherry opal leans red-pink, and the names overlap commercially.
- Mexican fire/cherry glass imitations: Glass may have round bubbles and feels heavier; opal is lighter with no perfect bubbles.
- Pink/red dyed agate: Harder and may show dye in fractures; cherry opal is softer and naturally colored.
- Rhodochrosite: Has cleavage, fizzes in warm acid, and is banded pink; opal does neither.
Where Cherry Opal Is Typically Found
Cherry opal comes mainly from Mexico (Querétaro, Jalisco, Magdalena), where it forms in gas cavities and fractures of rhyolitic volcanic rock alongside fire opal. Other red and pink common opals occur in Peru, the western U.S., and elsewhere. Look for it in volcanic host rock, often as veins and nodules in rhyolite.
Frequently asked questions
How can you tell if cherry opal is real?
Real cherry opal is a light, waxy-to-glassy red opal with a hardness of about 5.5–6.5 and low density; it is softer and lighter than carnelian and lacks the perfectly round bubbles of glass imitations.
What does cherry opal look like?
It is a translucent to semi-transparent opal with a warm cherry-red, pink-red, or red-orange body color and a waxy luster, sometimes with faint color flashes.
Cherry opal vs fire opal: what is the difference?
Both are Mexican volcanic opals; fire opal is typically more orange to amber while cherry opal leans red to pink, though the trade names overlap and refer to closely related material.
Is cherry opal the same as carnelian?
No. Carnelian is hard chalcedony quartz (Mohs 7), while cherry opal is softer hydrated silica (Mohs ~5.5–6.5) that is lighter and can be scratched by a quartz point.