At Soletterre, we reject 98% of the world’s lab-grown diamonds. To be selected for our collection, a stone must surpass these 20 rigorous parameters, ensuring that your diamond isn't just "certified," but extraordinary.
Authentication & Origin
The Foundation
1. Only Gemological Institute of America or International Gemological Institute certified diamonds.
2. Diamonds 0.30ct and above feature a microscopic laser-engraved serial number on the girdle.
3. No post-growth treatments, ensuring the diamond’s beauty is 100% natural and permanent.
4. We analyze the "Comments" section of every lab report to filter out stones with hidden structural or aesthetic issues.
Color & Clarity
The Elite Grade
5. We only use the highest color grades D, E, and F. These stones are icy white, with zero hint of yellow or brown.
6. Strictly flawless (FL) to VVS2. They are not only "eye-clean" but are structurally perfect even under 10x magnification.
7. Zero fluorescence only. We ensure your diamond never appears "milky" or "cloudy" in natural sunlight.
The "Triple Excellent" Performance
Certified by GIA & IGI
8. Only excellent cut. The most critical factor for "fire" and brilliance.
9. Only excellent polish. Ensuring a mirror-smooth surface for maximum light return.
10. Only excellent symmetry. Perfect alignment of facets for a balanced, harmonious sparkle.
"Most jewelers stop at the 4Cs of diamond. At Sōl et terre, that is where we begin."
The "Golden Ratio"
Precision Engineering
We go beyond the 4Cs to inspect the mathematical "DNA" of the diamond
11. Strictly curated ratio. We curate the length-to-width ratio to ensure the diamond shape looks elegant and intentional, never "stubby" or "too long."
12. The most optimized table size to balance internal "fire" with external "brilliance."
13. Calculated for perfect total depth to prevent light from "leaking" out the bottom of the stone.
14. The perfect crown angle to catch and disperse light into a rainbow spectrum.
15. Best angle for crown height to ensure the top of the diamond provides the necessary "lift" for light performance.
16. The calculated pavilion angle, known as the "engine" of the diamond, is precisely angled to bounce light back to your eye.
17. Optimized pavilion depth to eliminate "dark spots" in the center of the stone.
18. Girdle thickness measured to be durable enough for daily wear without adding unnecessary "hidden" weight.
The Visual Masterpiece
19. Only Perfect Pointed Culet to ensure a perfect point at the base of the stone to prevent light leakage.
20. No Bow-Tie Effect allowed. For fancy shapes (Ovals, Pears, Marquise), we manually inspect every stone to ensure there is no dark "bow-tie" shadow across the center, guaranteeing a clear, radiant window into the heart of your diamond.
The Sol et terre Manufacture Standard: 10 Points of Excellence
At Sōl et terre, we believe the quality of the metal must match the brilliance of the stone. Our manufacturing process combines traditional artistry with precision engineering to create pieces that are as durable as they are beautiful.
Each Item is Unique
Precision Engineering
1. Bespoke 3D Engineering. We do not use "all-fit" settings or mass-produced molds. Every piece is bespoke; we create a unique 3D model for each specific stone. This ensures the proportions are mathematically perfect and the setting is tailored exclusively to your diamond’s unique measurements.
2. Hand-Seated Precision. Every center stone is hand-fitted by a master setter. We don't just "drop in" a stone; we sculpt the prongs to the specific silhouette of your diamond, ensuring a secure, custom fit that maximizes light entry.
3. Exclusively with 18K Solid Gold and 950 Platinum. These premium, high-purity metals provide the luxurious weight and enduring strength required for a piece that will be worn every day for a lifetime.
4. Microscopic Quality Control. Every piece undergoes a final inspection under 20x magnification. This ensures your jewelry is flawless even under the macro lens of a wedding photographer, catching details invisible to the naked eye.
5. Micro-Pave Consistency. Our accent diamonds are meticulously sorted to match the center stone’s color and clarity. Each tiny stone is set under a microscope to create a level, "wall of light" finish that feels smooth to the touch and never snags.
Perfection In Every Detail
a promise of integrity
6. Reinforced Structural Integrity: We strategically reinforce our designs—the areas that take the most impact. This hidden engineering ensures your ring maintains its perfect circle and doesn't warp over time.
7. 5-Stage Mirror Polishing: Our pieces undergo an intensive multi-step buffing process. We polish every surface, including the hidden interior galleries, to ensure the piece reflects light from every angle, even the parts only you can see.
8. Laser-Welded Joins: We use precision laser technology for assembly rather than traditional soldering. This creates a molecular bond that is virtually invisible and significantly stronger, resulting in a seamless, "liquid metal" look.
9. High-Density Casting: We utilize advanced high pressure casting to eliminate microscopic air bubbles. This results in a metal that is denser and more scratch-resistant than standard jewelry, providing a superior foundation for your stones.
10. Premium Finish & Hypoallergenic Care: Our 950 Platinum is naturally white and hypoallergenic, while our 18K White Gold is finished with high-micron Rhodium. This provides that signature "Soletterre Icy Glow" that is gentle on sensitive skin and resistant to tarnish.
"From a unique 3D blueprint to the final hand-polish, your Soletterre piece is the only one of its kind in the world."
Your Vision Perfected
Contact us
Choosing or designing a piece of fine jewelry is more than a purchase—it is the creation of a future heirloom. At Soletterre, we believe the experience should be as flawless as the diamond itself. Our private consultations are designed to take the pressure out of the process, providing you with a dedicated expert to guide you through our 20-Parameter Diamond Standard and our Bespoke 3D Manufacture process. Talk to an expert and find your perfect piece