Your Collection, Curated
A Collection Built Around You
A great collection has a point of view, centered around an idea. That might be a place, a single gem species seen in all its variety, a color followed across the mineral kingdom or a standard of quality held from the first stone to the last. Tell us what draws you and we will build the collection with you — one considered gemstone at a time.
Every stone is chosen by hand, carries its Otzera 50 evaluation and arrives with its own Digital Gem Passport.
How It Works
Three Steps to Your Collection
Share Your Goals
Tell us what you would like to collect, how many stones and the range you have in mind. A clear direction helps; an open mind works just as well.
We Propose a Selection
We put forward gemstones that fit your goals and refine the selection with you until every stone earns its place in the collection.
Assembled and Documented
Each gemstone arrives in its own numbered case with its Otzera 50 evaluation and a Digital Gem Passport — a permanent record that stays with the stone.
Collections are offered in groups of three, five, ten and twenty, and in other formats as inventory permits.
Collecting Ideas
Four Ways to Build a Collection
Most collections begin with a single question: what connects these stones? Here are four answers collectors return to, with ideas drawn from gemstones in our collection today.
By Origin
Collect a Place
Gemstones carry the geology of where they formed, and collecting by origin turns a set of stones into a map. Origin should inform a collection, never carry it: each stone is still chosen because it is beautiful, and origin is stated only where the evidence supports it.
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Ceylon - The Gemstone Island
Sri Lanka has yielded sapphires and fine gemstones since antiquity — fantastic blues, yellows, pinks and purples, some collectors build around this famous locale.
See stones from Sri Lanka -
East Africa
Tanzania gives tanzanite, mint grossular garnet from the Merelani Hills and color-change sapphire. Neighboring Kenya gave tsavorite its name.
See stones from Tanzania -
Gems of the Americas
Oregon sunstone, Mexican fire opal, Yogo sapphire from Montana, Colombian emerald and Brazilian watermelon tourmaline.
Oregon sunstone·Mexican fire opal -
Gems of Southeast Asia
Some of the finest gemstones in the world originate from geologic deposits in Myanmar (Burma), Vietnam and Cambodia. These origins are highly desirable and may be the basis for a collection of fine spinel or ruby.
See spinel
By Species
Collect a Family
One mineral can look like a dozen different gemstones. Following a single species through its varieties trains the eye like nothing else — the same chemistry, touched by a trace of another element, becomes something entirely new.
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Garnets
Raspberry rhodolite, tsavorite, spessartite, almandite, grossular and Merelani mint, with color-change garnet besides — nearly every color within one family.
See garnets -
Tourmaline
Watermelon slices, indicolite blue, Nigerian pink and Namibian blue-green lagoon — tourmalines offer wide color ranges and varieties.
See tourmaline -
Corundum
Sapphire in blue, yellow, pink, purple and green — and ruby, which is simply red corundum.
See sapphire·About ruby -
Beryl
Aquamarine, heliodor, morganite and emerald: four names, one mineral.
See beryl
By Color
Collect a Color
Color is the first thing anyone notices in a gemstone, and color and cut together account for close to two-thirds of an Otzera 50 score. A color collection can hold one hue across many species or set the whole spectrum side by side.
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One Hue, Many Species
Blue across sapphire, tanzanite, zircon, aquamarine and indicolite shows how differently each material holds the same color.
See blue gemstones -
The Full Spectrum
One gemstone for each color, from red through violet, laid out like the tray shown here.
Browse by color in the shop -
Two Colors in One Stone
Watermelon tourmaline, bicolor tanzanite, parti sapphire and color-change garnet — gemstones that refuse to choose.
See watermelon tourmaline -
A Warm Palette
Fire opal, Oregon sunstone, spessartite, heliodor and citrine — the colors of embers and late light.
See fire opal
By Otzera 50 Rating
Collect a Standard
The Otzera 50 compares every gemstone with other examples of its own species, so a classification means the same thing whether the stone is a sapphire or a sunstone. That makes it a natural thread for a collection: one level of quality, held across very different gemstones.
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Signature and Exceptional
The two highest classifications — consistently high quality with a strong individual identity, and a rare convergence of beauty, quality and collector importance.
Browse all gemstones -
A Distinguished Collection
Clearly above commercial material, with one identifiable compromise at most — a demanding standard that still leaves room for many species and colors.
See rated gemstones -
Learn the Scale
One gemstone from each classification, Discovery through Exceptional, makes the progression something you can hold in your hand.
How the Otzera 50 works
“The most useful question is not ‘what is the highest number I can afford?’ but ‘what do I want this stone to do in my collection?’”
The Otzera 50
Every Collection
Presented Together, Documented Individually
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The Otzera 50 Evaluation
A score and classification for every stone, with a written evaluation explaining how it was reached.
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A Digital Gem Passport
A permanent record of the stone — gemology, documentation and provenance — that stays online after a sale, so the record travels with the stone.
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A Numbered Case
Each gemstone arrives in its own numbered case, which is also the safest place to keep a loose stone.
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Laboratory Documentation
Where a stone carries a laboratory report, the report travels with it.
Your Curated Collection
Begin Your Gemstone Journey
Tell us what you love, what you already own and what you would like your collection to become. We will reply with ideas and a first selection to consider. There is no need to know exactly what you want yet.
Your collection starts here.
Prefer to build a collection one gemstone a month? Explore The Gem Club.