20 products
Loose Gemstones
Browse faceted gemstones, color-zoned stones, and opal cabochons offered as exact pieces rather than representative stock photos.
Browse collectionSmall independent gemstone & mineral seller
Loose gemstones, opals & mineral specimens.
River Basin offers exact loose gemstones, opal cabochons, crystal specimens, and polished mineral specimens. Product pages pair individual photographs with available weights, dimensions, visible condition, and provenance notes, then direct buyers to the applicable marketplace for checkout.
27 active product pages · 32 exact SKU units
Featured exact piece · RBS-GEM-011
Ethiopian Welo Opal 3.98 ct Oval Cabochon with Play of Color
Shop by category
Browse the current gemstone and mineral catalog.
Explore individually photographed loose gemstones, opals, and mineral specimens through three focused collections.
5 products
Opals
The current opal collection includes individually photographed Welo opal cabochons, a selectable six-stone group, a freeform cabochon, and crystal opal rough.
Browse collection
7 products
Mineral Specimens
Explore exact mineral specimens ranging from natural crystal material to polished emerald-and-beryl matrix points with retained natural texture.
Browse collectionAvailable now
Featured gemstones & specimens
Current pieces selected across opals, faceted gemstones, and mineral specimens.
Opal cabochon
Etsy$49.95
Faceted loose gemstone
Purple 25.5 ct Cushion Cut Faceted Loose Gemstone
Purple gemstone
Etsy$49.95
Polished mineral specimen
North Carolina Emerald in Matrix 192.7 g Polished Point Mineral Specimen
North Carolina, USA
Etsy$44.95
Selectable loose opal
From$16.99
Exact-piece listings
See the actual stone and the details that matter.
Product pages connect the photographed piece with its seller SKU, available measurements, visible characteristics, and clearly qualified source information.
How listings are documentedExact item photographed
Product galleries show the specific stone or clearly numbered selectable pieces—not a generic stock substitute.
Facts kept in context
Available weight, dimensions, color, cut, visible condition, and seller SKU stay together on the product page.
Claims clearly qualified
Supplier information and independently verified facts are not treated as the same thing.
Buying guides
Gemstone and opal buying guides.
Read practical explanations of exact-piece listings, opal photography, origin qualifications, and visible inclusions before comparing stones.
View all guidesBuying guide
How to Read a Loose Gemstone Listing
A useful loose-gemstone listing separates visible facts from supplier information and laboratory conclusions. Here is what each part of a listing can—and cannot—tell you.
Opal guide
Opal Cabochon Buying Basics
Opal changes more with angle and lighting than many other gemstones. A good online listing should help you judge the exact stone across several views rather than reducing it to one bright frame.
Condition guide
What Visible Inclusions Mean in a Loose Gemstone
Inclusions are internal features; blemishes and wear occur at the surface. Both can be useful evidence, but neither should be hidden behind a generic clarity label or an overly flattering photograph.
Marketplace checkout
Buy through an established marketplace.
River Basin does not collect payment on this website. Product pages link to the exact Etsy listing and the River Basin eBay shop; a direct TikTok Shop destination is shown only when one has been verified for that product.
About River Basin
A small independent gemstone and mineral seller.
River Basin Stoneworks is a Wisconsin-based seller and curator with inventory obtained from multiple legitimate sources. The catalog is built around clear descriptions, exact-piece photography, and straightforward notes about condition and known provenance.
About River Basin