12.66 Ct. Green Prasiolite from Brazil

When you are searching for a single gemstone that answers the call for a dramatic engagement ring, a rare collector piece, or a show stopping statement jewel, this 12.66 carat asscher octagon green prasiolite from Brazil delivers on every front, and more. Transparent and intensively colored, this prasiolite measures 14.14 x 13.20 x 10.34 mm, and its faceted asscher cut exhibits the classic step facet geometry that creates depth and a hall of mirrors effect that invites the eye to linger. The clarity grade of very very slightly included evaluated at eye level means the gem reads clean to the eye while retaining natural individuality, and the excellent polish supplies crisp facet junctions and lively reflection. Heat treated to enhance the vibrant green tone, this natural prasiolite is a distinctive alternative to traditional green gemstones, offering a saturated, emotive color that feels modern and timeless at once.

Imagine this gem as the centerpiece of a variety of settings, each one tailored to different tastes, lifestyles, and design goals. As a solitaire ring, set high in a four or six prong mounting in platinum, white gold, yellow gold, or rose gold, the asscher shape reads elegant and architectural, with the step facets creating a calm luminous plane that looks refined from every angle. For those seeking extra brilliance and vintage glamour, a halo of small brilliant cut diamonds or colored sapphires will frame the square octagon silhouette and amplify the presence of the center stone, while a cathedral or split shank design lends a graceful lift and additional comfort for everyday wear. If you prefer enduring protection, a bezel setting will secure the gem and present a sleek contemporary profile that highlights the stone color, and for modern minimalists a tension setting will create a floating effect that showcases the transparency and intense hue. Consider three stone designs for symbolic engagement or anniversary pieces, with tapered trapezoids or baguettes flanking the prasiolite, and explore custom filigree, milgrain, or engraved shoulders to add heirloom character.

Beyond rings, the 12.66 carat size and proportions make this prasiolite exceptional as a pendant, a pair of matched drop earrings, or a single pendant for a bold statement. Mounted as a drop pendant, the asscher octagon sits close to the throat with a custom bail that complements the chosen metal, and a halo or bezel can be added for contrast and protection. For earrings, the color and symmetry of the asscher cut lend themselves to elegant stud settings, to chandelier designs that play with movement, or to drop earrings with complementary gems for a coordinated set. This stone also adapts beautifully to cufflinks, a bespoke brooch, or a signet style mens ring, because the asscher cut reads as both architectural and wearable. When designing a multi piece set, consider repeating the step facet language in metal work and in the selection of accent stones, so the entire ensemble feels cohesive. Our bench jewellers can produce CAD renderings and metal mockups so you can see how different prong styles, bezel widths, gallery heights, and split shank details will alter the look and wearability.

At The Natural Gemstone Company we understand that provenance, treatment, and craftsmanship matter as much as beauty, and we stand behind the sourcing and details of this Brazilian prasiolite. The heat treatment used to stabilize and intensify the green is a common and acceptable enhancement, and it allows us to present a durable and vividly colored gem with excellent polish and excellent potential for everyday wear when properly set and cared for. Because the clarity is described as very very slightly included evaluated at eye level, you will enjoy a clean visual experience without surprises, and our gem specialists can advise on orientations and setting choices that minimize any minor inclusions and maximize brilliance. We recommend protective settings for rings intended for daily wear, routine gentle cleaning with warm soapy water and a soft brush, and periodic inspection of prongs or bezels to maintain security. If your priority is a custom engagement ring, a bespoke pendant, a matched pair of earrings, or a collectible museum quality setting, allow our design team to guide you from concept through completion, including metal choice, accent stones, mounting style, and final finish, so the final piece reflects your taste and the exceptional character of this prasiolite. Contact The Natural Gemstone Company to begin a conversation about design possibilities, to request additional images or measurements, or to schedule a consultation with our gemologists and jewellers, and let this extraordinary 12.66 carat asscher octagon green prasiolite become the perfect solution to your search for a memorable and customizable gemstone.