March birthstones—aquamarine and bloodstone—offer two very different but equally captivating aesthetics. Aquamarine dazzles with its icy blue tones and transparency, while bloodstone stands out with its dark green base flecked with red. However, like many gemstones, both are often imitated. If you’re shopping for either, it’s important to know how to spot a genuine stone. Below, we break down expert-backed tips to help you identify authentic aquamarine and bloodstone with confidence.
Understanding Genuine Aquamarine: What to Look For
1. Color Consistency and Tone
True aquamarine ranges from pale sky blue to deeper seafoam blue. The most prized stones have a clear, even color without patches or zoning. Extremely dark blue stones may actually be other minerals like blue topaz.
Expert tip: If the stone appears “too blue” or electric blue, it could be treated or a different gem entirely.
2. Transparency and Clarity
Aquamarine is known for its high clarity and low inclusion rate. A genuine aquamarine should look clean to the naked eye. While minor inclusions may exist, they shouldn’t cloud the stone.
Watch out for: Murky or overly cloudy stones—these are often synthetic or lower-grade.
3. Hardness Test
Aquamarine scores a 7.5–8 on the Mohs scale, meaning it won’t scratch easily. You can gently test it against a material with a lower hardness (like glass), but for best results, rely on professional gem testing.
4. Check for Treatments
Most aquamarine on the market is heat-treated to enhance color. While this is industry standard and not a sign of fraud, untreated stones are rarer and may cost more.
Always ask: Is the stone heat-treated or natural in color?
Spotting Real Bloodstone: What Sets It Apart
1. Color and Inclusions
Bloodstone, a variety of chalcedony, is typically a dark green stone with red, rusty, or brown speckles caused by iron oxide. These “blood-like” spots are what give it its name.
Note: Fake bloodstones often have painted or uniform red flecks, which look too perfect or even.
2. Texture and Finish
Genuine bloodstone has a smooth, waxy luster and a slightly heavier feel due to its mineral content. It’s also opaque, unlike translucent green jades or glass substitutes.
Tip: Run your fingers over the surface—real bloodstone feels dense, not plasticky or slick like resin.
3. Scratch and Acid Resistance
Bloodstone scores about 6.5–7 on the Mohs scale, so it’s not easily scratched by a fingernail. Also, it should not react to vinegar or mild acids—a quick test some gemologists use.
Common Fakes and Lookalikes
| Fake Stone | Mimics | How to Tell |
|---|---|---|
| Blue Topaz | Aquamarine | Much brighter blue; higher refractive index |
| Glass or Resin | Both | Lighter weight, bubbles inside, too glossy |
| Dyed Chalcedony | Bloodstone | Overly vivid colors or no natural speckles |
| Synthetic Spinel | Aquamarine | May look too perfect, bright, or sparkly |
Get a Professional Appraisal
The most reliable way to authenticate a stone is by consulting a certified gemologist. Jewelers with a GIA (Gemological Institute of America) or AGS (American Gem Society) certification can:
- Test the stone’s refractive index
- Use a spectroscope to identify mineral composition
- Provide documentation of authenticity and treatment
Pro tip: Always request a certificate when purchasing high-value gemstone jewelry.
Final Thoughts: Shop Smart and Stay Informed
Whether you’re drawn to the tranquil charm of aquamarine or the earthy power of bloodstone, knowing how to verify authenticity will help you make a smart, lasting investment. Trust your eye, ask the right questions, and never hesitate to get a professional’s opinion. With these expert tips, you’ll be better equipped to spot genuine March birthstones—and wear them with confidence.
