Caldera Gem
An exclusive and highly curated selection of diamonds and gemstones for jewellers, designers and seekers of high quality.
Gemmologist Sourced
Our collections are a testament to our unwavering commitment to excellence. Each gemstone we source is considered for its visual appeal, structural integrity and design aesthetic.
We are experienced and dedicated gemmologists,
driven by a profound appreciation for the beauty and unique individuality of natural gemstones.
Our expertise ensures that every stone we source
meets our stringent standards for authenticity, brilliance, and quality and is handpicked with precision and care, sourced from reputable, ethical and trusted sources.
Industry Professionals
We collaborate closely with jewellers, designers & jewellery
artisans from Australia, the USA, United Kingdom, Canada, Hong Kong, Malaysia & Singapore, offering attractive trade discounts, exclusive wholesale website access and full service & support.
Our gemmologists are qualified with the Gemological Institute of America (GIA), the Gemmological Association of Great Britain (Gem-A) and the Gemmological Association of Australia (GAA).
★★★★★ Trustpilot Review
Truly Excellent Service
I had been thinking of buying a green sapphire for a while & I can honestly say that the customer service & the quality of the sapphire I bought are both second to none. If I could give Calderagem 6 stars I would!
~ Q & A Live Attendee, Republic of Ireland
★★★★★ Trustpilot Review
Peach Sapphire
I purchased an absolutely beautiful peach sapphire from Caldera Gem. I still haven’t made it into anything yet but have a few ideas and just love looking at it! I couldn’t find what I wanted in any of the stores and a search online led me to their website. I was surprised...Read More
~ Michelle, Great Britain
★★★★★ Trustpilot Review
Colombian Emerald
I recently had the pleasure of purchasing a Colombian emerald from Caldera Gem, and I must say, I am thoroughly impressed. From the moment I sent my enquiry I was blown away by the exceptional service provided....Read More
~ Prue Anderson, Australia
★★★★★ Trustpilot Review
Sapphire
After a fruitless search for the perfect yellow sapphire I finally found what I wanted at Caldera Gem. I was a bit hesitant to order something so expensive online but talking to them really put my mind at ease...Read More
~ Kylie, Australia
★★★★★ Trustpilot Review
Blue Sapphire
A few months ago I bought a blue sapphire from Caldera Gem and was blown away by the quality. The service was excellent and they sent me a number of additional photos and videos of the stone to help me decide on it.....Read More
~ Katie Barron Naturopath, Australia
Education & Guides
Sapphire vs Ruby vs Emerald: Gem Comparison Guide
Diamonds are often seen as a girl's best friend. But gemstones like emerald, ruby, and sapphire are gaining popularity too. Each of these gemstones is stunning in its own way. They have unique qual...
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Morganite vs Diamond: Which Gem Is Right for You?
Diamonds and morganite are top choices for jewelry, especially for engagement rings. This article will compare morganite and diamond. We'll look at their looks, price, and how sustainable they are....
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Sapphire Vs Diamond Engagement Ring: Which to Choose?
Choosing an engagement ring is a big decision. With so many options, it can feel overwhelming. Traditionally, diamonds were the go-to choice. But now, sapphires are gaining popularity for their ric...
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