Loose 18 carat Gemstones

Eighteen-carat gemstones represent the pinnacle of mineral perfection, often becoming individually cataloged treasures of international importance. Our collection features magnificent 18.0 ct masterpieces – each stone evaluated for exceptional quality and unique optical properties that create breathtaking visual impact and historic investment significance for elite collectors worldwide.
Filters
Gem type

Gem type

Color

Color

Shape

Shape

Diamond shape refers to the overall outline and facets of a diamond. It’s a crucial factor that affects a diamond’s brilliance, fire, and scintillation – its ability to reflect light and sparkle.

LEARN MORE ABOUT Shape
Origin

Origin

Treatment

Treatment

Carat weight

Carat weight

Diamond weight, also known as carat weight, is a measure of a diamond’s mass. It’s one of the four Cs (carat, cut, clarity, and color) that determine a diamond’s value and price.

LEARN MORE ABOUT Carat weight
1 items

18.88 Oval Shape Tanzanian Tanzanite

6,900.00$

FREQUENTLY ASKED QUESTIONS

Why are eighteen-carat gemstones considered national treasures in many countries?

Eighteen-carat precious stones represent such extraordinary natural phenomena that many nations have legislation specifically identifying them as important cultural patrimony. Their exceptional size represents geological perfection so remarkable that individual specimens often become internationally famous, featured in specialized exhibitions documenting the pinnacle of natural mineral formation. Pure, perfect quality gems of this magnitude combine supreme beauty with historical significance that transcends conventional valuation methods, making them important cultural artifacts worthy of perpetual preservation regardless of their commercial worth.

How are stones of this exceptional caliber typically authenticated?

Beyond standard laboratory certification, gems of 18 Ct typically undergo comprehensive scientific analysis including advanced spectroscopy, detailed crystallographic study, and specialized origin determination protocols. These extraordinary precious stones often receive dedicated scientific publications documenting their unique characteristics. For natural treasures of this significance, the world’s leading gemological laboratories employ their most experienced scientists and advanced technologies, ensuring these remarkable specimens receive definitive authentication worthy of their exceptional status among the rarest objects on earth.

What factors determine the true value of eighteen-carat investment gems?

Beyond standard quality parameters, stones of this extraordinary magnitude develop individual identities that transcend conventional valuation methods entirely. Their worth reflects not merely intrinsic qualities but their unique importance within mineralogical history and collecting significance. For investment-grade precious stones of 18 carats, provenance becomes fundamentally important, with documented connections to historical discoveries or important collections often increasing value exponentially for gems with distinguished lineage, making their authenticity and documented history as valuable as their physical characteristics.