Tourmaline — the rainbow gem with a watermelon trick

Tourmaline has the widest colour range of any gemstone — greens, pinks,
blues, yellows, and crystals that hold TWO colours at once.

• Watermelon tourmaline — pink core, green rim, sliced into slices that
  wear the whole effect.
• Paraiba — neon blue-green from copper; the trade's modern legend and
  the price ceiling of the family.
• Chrome tourmaline — vivid green, the tsavorite alternative.
• Indicolite & rubellite — deep blue and hot pink respectively.

Hardness 7-7.5: fine for pendants/earrings always, rings with sensible
settings. Some tourmalines arrive with fissures — eye-clean selection
matters.

Why designers love it — colour variety under one name means collections
can stay "one material" while changing palette — a trick straight from the
collection design guide.

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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

“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

“I enjoyed glass fusing because I wanted to learn about glass fusing and the class conducted provide enough information to play around with glass fusing.”

— Melani A. (Indonesia) · published student feedback

Free ways to explore

No sign-up, no payment — start with any of these.

WWatch a free gem webinarFREE
Full recorded sessions — the best free starting point.JJDMIS on YouTubeFREE
Course previews, blended-learning explainers and school life.FFree jewellery webinar replaysFREE
Recorded sessions on design and the jewellery industry.DDownload the gem e-bookFREE
The school's free guide to gems — pairs with the replays.

Keep exploring

Birthstones by month — the video-era gift guideThe twelve birthstones with colours, hardness and gift notes — the fastest way to personalTanzanite — one hill in TanzaniaTanzanite explained — the blue-violet zoisite found on one hill, heat treatment, pleochroiGem treatments explained — heat, oil, filling and diffusionThe gem treatment landscape explained — heat, oiling, filling, irradiation and diffusion —How gems are graded — colour, clarity, cut, weight beyond diamondsHow coloured gemstones are graded — colour first, then clarity by species, cut quality and

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