Gem Q&A

Expert insights on gemstone mining, valuation, luxury grading, and international market trends.

31 Questions
What is the difference between a “Carat” and a “Karat”?

Though they sound exactly the same, they measure completely different things in the jewelry world:TermWhat it MeasuresCarat (ct)The physical weight of a gemstone. (1 carat...

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2 days ago
Can gemstones lose their color over time?

Yes, some gemstones are sensitive to prolonged exposure to direct sunlight or intense heat. Stones like Amethyst, Kunzite, and Rose Quartz can fade if left...

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2 days ago
What is the largest sapphire ever found?

Sri Lanka currently holds the record for producing some of the world's most massive sapphires. In 2021, the "Serendipity Sapphire" was accidentally discovered by workmen...

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2 days ago
Why do some gemstones change color?

This magical-looking trait is caused by the way certain stones absorb different wavelengths of light depending on the light source. The most famous example is...

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2 days ago
What are “organic” gemstones?

While most gemstones are minerals mined from the earth, organic gemstones are created by living organisms (plants or animals). Organic GemOriginPearlFormed inside the shells of...

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2 days ago
What is the difference between a “faceted” cut and a “cabochon” cut?

Gem cutters (lapidaries) use different techniques depending on the stone's optical properties and clarity: Faceted Cut: The stone is cut with multiple flat geometric surfaces...

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2 days ago
What are the most important tips for buying gemstones safely?

If you are planning to invest in a valuable gemstone, keep these rules in mind to protect yourself: Always ask for a Certificate: Never buy...

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2 days ago
What is a “Geuda” stone?

Geuda is a semi-transparent, pale, and cloudy form of corundum found abundantly in Sri Lanka. For centuries, it was considered low-value, useless gravel. However, in...

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2 days ago
What does it mean when a gemstone is “treated” or “enhanced”?

Many gemstones undergo treatments after being mined to improve their color or clarity. This is a standard and acceptable industry practice, provided the seller discloses...

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2 days ago
How are gemstones traditionally mined in Sri Lanka?

Sri Lanka is famous for its traditional, relatively eco-friendly mining methods, most commonly known as pit mining or Pathal. Miners dig a deep, vertical shaft...

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2 days ago
What is the rarest and most expensive gemstone in the world?

While high-quality Alexandrite and Padparadscha Sapphires from Sri Lanka are incredibly rare, the Red Diamond holds the title for the most expensive gemstone per carat...

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2 days ago
Are lab-created (synthetic) gemstones considered “real”?

Yes, physically, chemically, and optically, they are completely real. Lab-grown gemstones have the exact same chemical composition and crystal structure as naturally mined gemstones. Natural...

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2 days ago
What are the “Four Cs” of evaluating a gemstone?

CriteriaDescriptionColorThe hue, tone, and color saturation of the gem. For colored stones, this is usually the single most important factor.ClarityThe absence of internal flaws (inclusions)...

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2 days ago
What is the difference between “precious” and “semi-precious” stones?

Traditionally, the jewelry industry divided gemstones into two main categories based on historical rarity and value: Precious Stones: Only four gems fall into this classic...

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2 days ago
How can you tell if a gemstone is real?

While there are simple observations you can make at home, professional identification is always best. Here is what experts look for: Weight (Specific Gravity): Real...

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2 days ago