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Why do we use diamonds to test gemstones?

Diamonds are used to test various gemstones like Sapphires and rubies, emeralds, topaz, Garnet and more

By Gaurav Sharma
4 min read
testing gemstones

Why do we use diamonds to test gemstones

Diamonds are used to test a variety of gemstones, primarily to assess their hardness, thermal conductivity, and other distinguishing properties. Here are some of the gemstones that are commonly tested using diamonds:

1. Corundum Family (Sapphire and Ruby)

  • Sapphire: Both blue sapphires and other colored varieties.
  • Ruby: The red variety of corundum.

Corundum is the second hardest natural mineral, rated 9 on the Mohs scale. Diamonds, being rated 10, can scratch corundum, confirming its hardness.

Ruby stone ring

2. Beryl Family

  • Emerald: The green variety of beryl.
  • Aquamarine: The blue or turquoise variety.
  • Morganite: The pink variety.

Beryl gemstones are rated 7.5 to 8 on the Mohs scale, and testing them with a diamond can help verify their hardness and differentiate them from softer stones.

3. Quartz Family

  • Amethyst: The purple variety of quartz.
  • Citrine: The yellow to brownish-orange variety.
  • Rose Quartz: The pink variety.

Quartz is rated 7 on the Mohs scale. Using a diamond to test quartz helps confirm its hardness and distinguish it from similar-looking but softer stones.

4. Topaz

Topaz is rated 8 on the Mohs scale. Testing topaz with a diamond can confirm its hardness and help differentiate it from other stones with similar appearances but different hardness levels.

Blue Topaz Pendant

5. Spinel

Spinel is rated 7.5 to 8 on the Mohs scale. Testing it with a diamond can confirm its hardness and authenticity, as spinel can sometimes be confused with ruby and sapphire due to its similar appearance.

6. Garnet

Garnets range from 6.5 to 7.5 on the Mohs scale. Using a diamond to test garnet helps verify its hardness and distinguish it from other gemstones with similar colors but different hardness levels.

7. Tourmaline

Tourmaline is rated 7 to 7.5 on the Mohs scale. Testing it with a diamond can help confirm its hardness and differentiate it from other similar-looking stones.

Black Tourmaline Bracelet - for protection from negative energy (Nazar)

8. Zircon

Zircon is rated 6.5 to 7.5 on the Mohs scale. Diamonds can scratch zircon, verifying its hardness and distinguishing it from diamond simulants like cubic zirconia, which is often confused with real zircon.

9. Peridot

Peridot is rated 6.5 to 7 on the Mohs scale. Testing it with a diamond can confirm its hardness and help differentiate it from other green gemstones.

Using diamonds to test other gemstones primarily serves as a means of verification and comparison due to diamonds' unique properties. Here are the key reasons why diamonds are used in testing gemstones:

1. Hardness

Diamonds are the hardest known natural material, rated 10 on the Mohs scale of mineral hardness. This makes them an ideal standard for testing the hardness of other gemstones. By scratching a gemstone with a diamond, gemologists can determine its hardness level, helping to confirm its identity and authenticity.

2. Thermal Conductivity

Diamonds have exceptional thermal conductivity, which is significantly higher than most other gemstones. Gem testers use this property to distinguish diamonds from imitations and other gemstones. When a gemstone is tested with a thermal conductivity tester, diamonds will exhibit a distinct response compared to other stones, aiding in accurate identification.

3. Optical Properties

Diamonds possess unique optical properties, such as high refractive index and dispersion, which contribute to their brilliance and fire. By comparing these optical characteristics, gemologists can differentiate diamonds from similar-looking gemstones like moissanite or cubic zirconia. Special tools and tests can highlight these differences, confirming whether a stone is a diamond or an imitation.

4. Chemical Composition

Diamonds are made of pure carbon arranged in a crystal lattice, giving them distinct chemical properties. Advanced testing techniques, like spectroscopy, can analyze the chemical composition of gemstones. Comparing a stone's chemical makeup to that of a diamond helps in identifying synthetic or treated gemstones versus natural ones.

5. Inclusions and Flaws

Diamonds often contain unique inclusions and flaws that are studied under magnification. Comparing these internal features with those of other gemstones can help in identifying and authenticating stones. Inclusions can also indicate whether a gemstone is natural or synthetic.

6. Market Standard

Diamonds are considered the gold standard in the gemstone industry. They are often used as a benchmark for evaluating the quality, cut, and value of other gemstones. Comparing gemstones to diamonds in terms of clarity, cut, and brilliance provides a consistent and reliable standard in the gem trade.

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Find Your Lucky Gemstone, Rudraksha & Puja as per Your Birth Chart

Vedic astrology assigns a ruling planet to your ascendant (lagna), and that planet's gemstone, rudraksha, and puja are your most powerful remedies. This page calculates your lagna in real time and shows you all three — for free, in 30 seconds. Whether you're looking for the right gemstone for your birth chart, the correct Mukhi Rudraksha for your ruling planet, or the appropriate Graha Shanti puja, this tool gives you a Vedic-astrologer-curated starting point.

What is a Lagna and Why It Matters

The lagna, or ascendant, is the zodiac sign rising on the eastern horizon at the moment of your birth. In Vedic astrology, it represents your physical body, personality, and life path — and crucially, the planet that rules your lagna is your most important planetary ally. Strengthening this ruling planet (your lagnesh) through gemstones, rudraksha, and puja brings the most direct, measurable benefit. Unlike sun-sign astrology — which assigns one of 12 signs to everyone based on a single month-long period — your lagna is precise: it changes every two hours, making it deeply personal.

Lucky Gemstone as per Your Birth Chart

The natal gemstone for any individual is determined by the lord of their lagna. For Aries and Scorpio ascendants ruled by Mars, Red Coral (Moonga) is the prescribed gemstone. Cancer ascendants ruled by Moon wear Pearl (Moti). Leo ascendants ruled by Sun wear Ruby (Manik). And so on for all 12 ascendants. Wearing your lagna-lord's gemstone strengthens your personality, vitality, and the karmic intentions you arrived with. Vedic Crystals recommends the primary gemstone first, with an affordable alternative listed for accessibility — both carry the same planetary energy, differing only in cost and rarity.

Lucky Rudraksha as per Your Birth Chart

Each Mukhi (face) of a Rudraksha corresponds to a specific deity and planet. Wearing the Mukhi corresponding to your lagna lord aligns your body's subtle energy with your ruling planet. A 5 Mukhi Rudraksha for Jupiter (ruling Sagittarius and Pisces), 7 Mukhi for Saturn (Capricorn and Aquarius), 1 Mukhi for Sun (Leo), 2 Mukhi for Moon (Cancer), and so on. Rudraksha is gentler than gemstone — a good starting point for those new to Vedic remedies, or for those who prefer a non-jewellery practice. All Rudraksha at Vedic Crystals are X-ray certified.

Puja for Your Birth Chart

A Graha Shanti puja — performed by Vedic pandits — pacifies the afflictions of a specific planet through ritualised mantra recitation (between 5,000 and 23,000 chants depending on the planet). The puja for your lagna lord is especially powerful: it doesn't just remedy current afflictions, it strengthens the planet's overall placement in your chart. Performed once or on planetary transits, this remedy has been practiced in continuous unbroken tradition for over 3,000 years.

How Vedic Crystals Recommends

The Vedic Remedy Finder uses lagna-based logic — the most universally applicable classical method. For users wanting deeper analysis (dasha-based recommendations, dosha analysis including Mangal, Kaal Sarp, and Pitru doshas, and personalised wearing instructions), our 124+ astrologer panel prepares a complete written report delivered within 48 hours. The recommendations on this page are real and accurate; the report goes further.

Frequently Asked Questions

Is the Vedic Remedy Finder accurate?

Yes. The calculations use real astronomical ephemeris data — the same data used by traditional Vedic astrologers — computed in real time against your exact birth date, time, and location. The lagna-based recommendations follow classical Jyotisa principles.

What if I don't know my exact birth time?

Lagna calculations require birth time accurate to within a few minutes — the lagna changes roughly every two hours. If you don't know your time, our palmists can recommend your gemstone, rudraksha, and puja by reading photos of your palms (a 5,000-year-old method from Samudrika Shastra). Request a palm-based remedy report →

Why is the recommendation based on Lagna, not Rashi or Sun Sign?

Lagna (the ascendant) represents your physical self and life path — the most personal of the three. Sun sign changes monthly, Rashi (moon sign) changes every 2-3 days, but lagna changes every two hours, making it precise to your individual birth.

Are the gemstones at Vedic Crystals genuine?

Every gemstone is 100% natural and comes with a certificate of authenticity from GIA, IGI, Govt Labs, or other reputed gemological laboratories. We have served 19,000+ customers across 50+ countries with a 4.82 average rating.

Should I wear the gemstone or the rudraksha?

Both can be worn together — they reinforce each other. If you must choose one, start with rudraksha (gentler, more accessible) and add the gemstone after a few weeks.

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