Jewellery VideoRuby — the king of gems, a buyer's guide
Red corundum — the same mineral family as sapphire, priced like royalty.
Ruby is corundum coloured red by chromium — sapphire's sibling at a
higher price point, and history's most consistently royal gem.
What drives value — colour first: the vivid red with a whisper of blue
("pigeon's blood" in trade poetry) commands the market. Then clarity (rubies
are typically included; eye-clean large stones are rare), then origin
(Burmese stones carry a premium; the trade knows it).
Treatments, honestly — heat treatment is the industry norm and stable;
glass-filling of low-grade material is the one to watch for. Sellers worth
having disclose either way — the question "is this heated?" is a legitimate
buyer move everywhere in the trade.
For jewellery use — hardness 9: any placement, daily wear, no drama.
Gem identification — telling heated from filled, Burmese from basaltic — is
exactly what the identification course practises with real
stones.
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
“There is a very wide range of jewellery design programmes. Tanja's an expert and she encourages the class and is also open for catch-ups later.”
— Cecilia O. (Singapore) · published student feedback
“I will use the skills learnt to make jewellery and other items, such as phone chains, christmas tree decorations & hopefully sell them.”
— Nadia W. (England) · 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