16.91 Ct. Green Prasiolite from Brazil

One beautiful transparent 16.91 carat oval shape green prasiolite is presented with precise dimensions of 19.61 x 15.28 x 9.98 mm, a mixed brilliant cut, intense color intensity, and an excellent polish. This gem originates from Brazil and has undergone a professional heat treatment, a common and stable enhancement used to produce and refine the vivid green that characterizes high quality prasiolite. At The Natural Gemstone Company we describe this stone in clear, objective terms so that an informed buyer can assess its attributes at a glance. The combination of substantial carat weight and the oval mixed brilliant design produces a commanding face up presence, while the proportioned depth and table created by the cut optimize light return and color saturation, ensuring that the stone reads as lively and vivid in hand or set into a bespoke design.

From a gemological grading perspective this prasiolite exhibits a clarity grade of very very slightly included as evaluated at eye level, a level of clarity that will please collectors and connoisseurs who require minimal visual distractions without paying premium prices for flawless material. Prasiolite, a green variety of quartz, typically presents with excellent transparency and a refractive index and durability profile that make it very wearable, including hardness seven on the Mohs scale, which is well suited for daily jewelry with appropriate care. The mixed brilliant cut balances faceting for scintillation and color performance, allowing the intense green to display both depth and vibrant sparkle. The excellent polish on each facet edge delivers crisp light return and a pleasing tactile finish, qualities that experienced lapidaries achieve by careful facet placement and polishing sequences.

Inclusions in this prasiolite are not defects in the pejorative sense, rather they are natural identifiers that add character and provenance to the gem. Very very slightly included as judged at eye level indicates inclusions are minimal and will generally require magnification to study in detail. Typical inclusion types for Brazilian prasiolite include small mineral crystals, healed fissures, liquid and gas two phase inclusions, and occasionally fine growth tubes or parallel zoning features that reflect the crystal growth environment. These internal features act as a fingerprint for the stone, allowing gemologists to distinguish natural material from synthetic counterparts, and to support origin statements when combined with other data. For an educated buyer, the presence of these tiny, well healed or discrete inclusions affirms the natural origin and geological history of the gem, while still preserving the visual purity and appeal that make this piece attractive for high end jewelry.

This prasiolite offers an excellent value proposition for collectors and custom jewelry designers who appreciate measured, factual descriptions. Its 16.91 carat weight and substantial dimensions make it a rare and desirable example of green quartz at this scale, particularly with intense color and an eye level clarity assessment of very very slightly included. Origin from Brazil adds further market appeal, as Brazil remains a renowned source for fine prasiolite and related quartz varieties, offering consistent crystal quality and well documented supply chains. Heat treatment is disclosed transparently, reflecting industry accepted practice that enhances color in a stable and enduring way, without compromising structural integrity when the gem is set or worn. At The Natural Gemstone Company we stand behind our descriptions, and we encourage potential buyers to request additional imagery, magnified photographs, or third party certification where needed, to confirm the inclusion characteristics or to support any insurance appraisal needs. This green prasiolite combines natural fingerprinting inclusions, reliable treatments, and exemplary cutting and polish, resulting in a stone that appeals to the technically minded buyer as well as to the design oriented client seeking a bold, elegant centerpiece.