Education Center
Gemstone Care & Gemstone Education Center
Learn where gemstones come from, how they are formed, how to care for them properly, and what can damage or change their appearance over time — from the experienced jewelers at HA Jewelers in Roseville, MI.
Section 01
The History of Gemstones
3000 BC
Ancient Egyptians treasure emeralds, lapis lazuli, and turquoise — set into royal regalia and burial jewelry.
Greek & Roman Era
Greeks and Romans believe gemstones carry mystical powers — used as talismans, signet rings, and amulets.
Medieval Royalty
Rubies and sapphires become the prized gems of European monarchs, set into crowns and ceremonial jewels.
Renaissance
Master cutters in Antwerp and Venice perfect faceting techniques, unlocking the brilliance of colored stones.
Today
Gemstones are mined ethically worldwide and remain timeless symbols of beauty, wealth, and personal expression.
Section 02
Where Do Gemstones Come From?
Every gemstone has a geographic story. Origin often impacts color, clarity, and value.
Emerald
Colombian emeralds are considered the finest in the world for their pure green color.
Ruby
Burmese 'pigeon blood' rubies command the highest prices per carat in the world.
Sapphire
Kashmir sapphires are exceptionally rare and prized for their cornflower blue hue.
Diamond
Botswana is the world's largest producer of gem-quality diamonds by value.
Tanzanite
Found only in a small area near Mount Kilimanjaro — rarer than diamond.
Aquamarine
Brazil's Minas Gerais region produces the finest aquamarine in deep sea-blue hues.
Opal
Australia produces over 95% of the world's precious opal.
Turquoise
Persian turquoise is famed for its uniform sky-blue color and minimal matrix.
Amethyst
Uruguayan amethyst is known for its deep violet saturation.
Garnet
Found in many colors — tsavorite (green) and rhodolite (raspberry) are most prized.
Section 03
How Gemstones Are Formed
Igneous Formation
Born from cooling magma deep within the Earth. Diamonds, peridot, topaz, and zircon form when molten rock crystallizes under extreme pressure and heat.
Metamorphic Formation
Created when existing minerals are transformed by heat, pressure, and chemical activity. Rubies, sapphires, emeralds, and garnets all form this way.
Sedimentary Formation
Formed near the Earth's surface through water and weathering. Opals and turquoise develop slowly inside cavities and fractures over millions of years.
Section 04
Natural vs Lab-Created Gemstones
Natural Gemstones
- Formed over millions of years in nature
- Rare and finite supply
- Higher long-term value
- Each stone has a unique inclusion fingerprint
Lab-Created Gemstones
- Created by humans in controlled environments
- Identical chemistry to natural counterparts
- More affordable per carat
- Cleaner, with fewer inclusions
| Gemstone | Natural | Lab-Created |
|---|---|---|
| Ruby | Formed over millions of years in metamorphic rock. Often heat-treated. | Identical chemistry (corundum). Grown in weeks. Fewer inclusions, lower cost. |
| Sapphire | Mined globally. Each stone has a unique inclusion fingerprint. | Created via flame fusion or hydrothermal growth. Same hardness (9). |
| Emerald | Natural inclusions ('jardin') are expected and accepted. | Grown hydrothermally. Cleaner appearance, more affordable, same beryl composition. |
| Diamond | Formed 1–3 billion years ago, 100+ miles below the surface. | HPHT or CVD grown in 2–4 weeks. Identical physical, chemical, and optical properties. |
Section 05
Gemstone Hardness Chart (Mohs Scale)
Hardness measures scratch resistance — but not toughness. A diamond can chip; a jade is harder to break.
Stones rated 7+ generally resist scratching from everyday dust. Stones below 7 require protective settings and gentle wear.
Section 06
Which Gemstones Can Be Damaged By Heat?
Heat-Sensitive Stones
Possible Damage
- Cracking
- Color change
- Drying out
- Internal fractures
- Surface damage
This is why expert jewelry repair matters — torch work on a ring with a heat-sensitive stone requires removing the gem first.
Section 07
Which Gemstones Can Change Color?
Amethyst
Can fade with prolonged sunlight exposure.
Topaz
Certain irradiated or treated stones may fade over time.
Kunzite
Highly sensitive to sunlight — known as the 'evening stone'.
Fluorite
Can gradually lose color saturation with UV exposure.
Treated Gems
Many treated stones may shift in appearance with heat or UV.
Section 08 & 09
Ultrasonic Cleaning Safety
Never Ultrasonic Clean
Ultrasonic vibrations can shatter fragile or porous stones, dissolve fillers, and dislodge treated material.
Generally Safe
Only if the stone is untreated and free of fractures or heavy inclusions. Professional inspection is always recommended.
Section 10
Common Gemstone Problems
Section 11
Birthstone Guide
Garnet
Care: Safe for warm soapy water and ultrasonic cleaning.
Amethyst
Care: Avoid prolonged sunlight to prevent fading.
Aquamarine
Care: Warm soapy water. Avoid harsh heat.
Diamond
Care: Safe for ultrasonic and steam cleaning.
Emerald
Care: Warm soapy water only — never ultrasonic.
Pearl
Care: Wipe with soft damp cloth. Last on, first off.
Ruby
Care: Safe for ultrasonic if untreated and unfractured.
Peridot
Care: Soft cloth and mild soap. Avoid hard impacts.
Sapphire
Care: Excellent durability. Safe for daily wear.
Opal / Tourmaline
Care: Opal: never ultrasonic. Keep hydrated.
Topaz / Citrine
Care: Avoid prolonged heat and sunlight.
Tanzanite / Turquoise
Care: Soft cloth only. Avoid chemicals and heat.
Section 12
How To Care For Gemstones
Do
- Store each piece separately to prevent scratches
- Clean gently with appropriate methods per stone
- Remove jewelry before sports, gardening, or cleaning
- Inspect prongs and settings annually
- Schedule professional cleanings every 6 months
Avoid
- Household chemicals and ammonia
- Chlorine (pools, hot tubs, bleach)
- Extreme heat and sudden temperature change
- Direct sunlight for sensitive stones
- Impact, dropping, or hard knocks
Section 13
Gemstone Cleaning Guide
| Gemstone | Safe Methods | Unsafe Methods | Maintenance |
|---|---|---|---|
| Diamond | Ultrasonic, steam, warm soapy water | Harsh acids | Professional cleaning every 6 months |
| Ruby | Warm soapy water, ultrasonic (if untreated) | Harsh chemicals | Annual prong check |
| Sapphire | Ultrasonic, steam, mild soap | Sudden temperature change | Annual inspection |
| Emerald | Warm soapy water, soft brush | Ultrasonic, steam, solvents | Re-oil every 2–3 years |
| Pearl | Soft damp cloth only | Ultrasonic, ammonia, perfume | Re-string annually if worn often |
| Opal | Damp cloth, mild soap | Ultrasonic, heat, dry air | Store in damp cloth if dry climate |
| Tanzanite | Warm soapy water, soft brush | Ultrasonic, steam, impact | Protective settings recommended |
| Turquoise | Soft dry cloth | Water, oils, chemicals, ultrasonic | Wipe after each wear |
Section 14
Most Valuable Gemstones In The World
Diamond
Universal benchmark. Top-color D-flawless stones reach $25,000+ per carat.
Ruby
Burmese 'pigeon blood' rubies can exceed $1 million per carat at auction.
Emerald
Colombian emeralds with rich green saturation rival the price of fine diamond.
Sapphire
Kashmir cornflower blue sapphires command extraordinary prices.
Alexandrite
Rare color-change stone — green by day, red by lamplight.
Paraiba Tourmaline
Electric neon-blue. Among the most valuable gemstones per carat.
Jadeite
Imperial green jadeite is treasured in Asia and rivals top emerald.
Tanzanite
Found in only one place on Earth — supply expected to be depleted within decades.
Section 15
Frequently Asked Questions
Related Services & Education
Why Trust HA Jewelers
Need Help With Your Gemstone Jewelry?
Bring your jewelry to HA Jewelers for gemstone inspections, stone tightening, cleaning, repairs, and professional care recommendations — no appointment needed.