Jewellery VideoOpal — play of colour, care and buying
A gem that flashes entire sunsets — and asks for a little respect.
Opal is hydrated silica — a gem that stacks microscopic silica spheres to
diffract light into play-of-colour.
The vocabulary — body tone (black opal is the dark-bodied, most valued
kind; white/crystal opal lighter; fire opal orange); pattern (harlequin,
pinfire, flash); and origin (Australia dominates, Ethiopia and Mexico
follow).
The water question — opal contains molecular water; extreme dryness or
heat can crack it (crazing). Storage with a damp cloth for long sleeps,
avoid sudden heat, no ultrasonics.
Hardness reality — Mohs 5-6: pendants and earrings over rings, or
protective bezels.
Opal identification and stability checking are part of the
identification course's practicum.
Go deeper — free
Watch the free replays at the gem webinar library — the gem e-book is the written companion. When curiosity becomes commitment, the gemmology foundation course is the ladder's first rung (online entry: GT100e); dates on the calendar. Play Name That Gem to train the eye between sessions.
What students say
“It is fun, interesting & educational!”
— Shahirah A. (Singapore) · published student feedback
“I will use the skills acquired to make pieces for family, friends and of course, myself! If I could get to a point of eventually selling pieces, even better!”
— Elena A. (Australia) · published student feedback
Free ways to explore
No sign-up, no payment — start with any of these.
Full recorded sessions — the best free starting point.JDMIS on YouTubeFREE
Course previews, blended-learning explainers and school life.Free jewellery webinar replaysFREE
Recorded sessions on design and the jewellery industry.Download the gem e-bookFREE
The school's free guide to gems — pairs with the replays.
See the online and blended options
Gemmology can be started fully online, and every classroom course at JDMIS has a video-supported path.
Visit jdmis.edu.sg