What to Check in a Gem Certificate: Complete Explained (Sri Lanka Guide)
When buying a gemstone — especially high-value stones like Blue Sapphire, Ruby, or Cat’s Eye — the certificate is your best protection.
A Gem Certificate (also called a Gem Report) proves the gemstone is:
✅ Real
✅ Natural
✅ Correctly identified
✅ Properly valued
But many buyers don’t know how to read a certificate — and that can be risky!
Here’s a simple guide to help you check every important detail ✅
✅ 1️⃣ Gem Type (Species & Variety)
The certificate should clearly state:
✔ Gem species (e.g., Corundum)
✔ Variety (e.g., Blue Sapphire)
❌ If the certificate only says “Stone” or “Glass”… walk away!
✅ 2️⃣ Treatment Information
Most sapphires are heat-treated — that’s normal.
But you MUST know whether a gem is:
- Heated
- Unheated ✅ Rare & more valuable
- Glass-filled ❌ Avoid
- Diffusion treated ❌ Very low-value stone
📌 Treatment affects price more than anything else!
✅ 3️⃣ Color Description
Color should be described accurately:
Examples:
- “Royal Blue Sapphire”
- “Cornflower Blue”
- “Vivid Red Ruby”
If description is vague…
⚠️ It might be a low-grade stone
✅ 4️⃣ Carat Weight & Dimensions
Always check:
✔ Carats
✔ Length x Width x Height (mm)
Example:
2.45 ct | 8.3 × 6.2 × 4.1 mm
If weight and size look mismatched → ⚠️ Something is wrong.
✅ 5️⃣ Clarity Grade
Clarity tells you how clean the stone is:
- IF / VVS – Extremely clean (rare)
- VS / SI – Light inclusions (normal)
- I1 / I2 – Many visible inclusions (cheap)
Remember:
Natural gems always have small inclusions ✅
Zero inclusions = 🚩 usually synthetic
✅ 6️⃣ Origin of the Gemstone
Example:
- Origin: Sri Lanka (Ceylon) ✅ adds value
- Africa or Thailand origin — still real, but lower price
Origin = price difference
✅ 7️⃣ Photo & Report Number
Every authentic certificate has:
📌 Photo of the exact stone
📌 Unique report number
✅ You can check the number online to verify authenticity
❌ No number = Fake or unreliable certificate
✅ Trusted Gem Labs in Sri Lanka
Here are the reliable authorities you can trust:
🇱🇰 NGJA – National Gem & Jewellery Authority
🇱🇰 GLC – Gem & Lapidary Council
🌍 GIA, IGI – International labs
Avoid unknown labs with home-printed report sheets 🚫
✅ Why Certificates Matter
✔ Confirms the gem is natural
✔ Protects buyer investment
✔ Supports future resale
✔ Prevents scams
📌 Always ask for a certificate BEFORE buying!
✅ Buy With Confidence on GemX.lk
GemX is Sri Lanka’s first and only online gem marketplace where:
✅ Buyers contact sellers directly
✅ Sellers can upload gem certificates
✅ Deals are transparent & commission-free
✅ Everything is 100% Free
🛍️ Start browsing certified gems now:
👉 www.gemx.lk
Gem𝕏 — Where the Gem Meets You 💎
