How to Check Synthetic Ruby Under a Microscope – Curved Striae, Gas Bubbles, and Quench Crackled

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Time stamps:
1) Answer to which Rubies are Synthetics (min 2:11)
2) Equipment Recommendation – Darkfield Gem Loupe (min 3:19)
3) Equipment Recommendation – Gem Microscope (min 4:38)
4) “Curved Striae” under the microscope (min 5:35)
5) “Gas Bubbles” under the microscope (min 7:07)
6) “Quench crackled” under the microscope (min 8:30)
7) Final Thoughts (min 9:50)

Gem Equipment [Amazon Links]:
a) Professional 18mm 10x Handheld Darkfield Loupe LED with Flashlight, Dark Field Hastings Loupe Magnifier

b) AmScope GM400TZ-M Digital Trinocular Gemology Stereo Zoom Microscope

Other YouTube Ruby Videos links provided below:
a) 1 carat Ruby microscope videos – includes, unheated, heated, flux-residue (flux treatment) –

b) Glass Filled vs Unheated ruby –

For additional pictures and explanation regarding synthetic gemstones (ruby, sapphire & emerald) I would recommend checking our very popular blog post:

In this video, we look at three different synthetic rubies under the microscope – Curved Striae, Gas Bubbles, and Quench Crackled. All three have inclusions which help us distinguish between synthetic and natural rubies.

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