By PickSmartly Editorial Team
· Updated Aug 4, 2026
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Entering the world of loose gemstones is a journey of both aesthetic appreciation and technical scrutiny. Whether you are looking to commission a bespoke piece of fine jewelry or building a private investment collection, the quality of a loose stone dictates the final outcome of your project. Unlike faceted diamonds, which follow standardized grading scales, colored gemstones vary wildly in hue, saturation, and tone, making the selection process deeply personal yet technically demanding. When shopping for loose gemstones, you are not just buying a color. You are buying light performance, mineral purity, and longevity.
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Our Top Picks for Letmexc Loose Gemstones
The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.
Letmexc 8 Hearts & Arrows White Moissanite Loose Stone Real D Colorless VVS1 Synthetic Diamond Round Brilliant Cut for Jewery Making with GRA Certific...
QUALITY GURANTEE: All our moissanite will be tested before shipping , and it reaches real D colorless and the clarity scale reaches the colorless standard of VVS1. Natural Diamond Hardness is 10 and Moissanite Hardness is 9.25. so moissanite stone can not be scuffed easily.
MEASUREMENTS DETAILS: Carat weight and measurements of moissanite is as follows 0.3ct=4.0mm, 0.4ct=4.5mm, 0.5ct=5.0mm, 0.6ct=5.5mm, 0.8ct=6.0mm, 1.0ct=6.5mm, 1.2ct=7.0mm, 1.5ct=7.5mm, 2.0ct=8.0mm, 2.5ct=8.5mm, 3.0ct=9.0mm, 3.5ct=9.5mm, 4.0ct=10.0mm, 4.5ct=10.5mm, 5.0ct=11.0mm, 6.0ct=12.0mm.GREAT CUSTOMER SERVICES: All our moissanite stone arrives with a jewelry box, best for presentation and protection of the stone.
COMES WITH CERTIFICATE: Each moissanite stone has the laser number (a unparalleled GRA report number) on the girdle of the stone and comes with a Certificate of Authenticity which can be searched on the GRA website.
PEFECT FOR JEWELRY MAKING: Moissanite is the best replacement to real diamond and can be 100% passed through a diamond pen, but it’s more sparkling, brighter than the real diamond and the fire is also more stunning. it’s perfect for pendant, stud, engagement ring, wedding ring or promise ring.
NOTICE BEFORE BUYING There is an error of ±0.05mm in dimensioning and manual actual measurement. Industry rules：the weight of the moissanite is indicated as the weight of the diamond. The actual weight of the Moissanite should be the marked weight of the diamond 90%.Example: The actual weight of the moissanite marked as 1 carat is0.88- 0.91 carats.
A brilliant explosion of light hits your eyes the moment you catch the fire in this D colorless, VVS1 clarity moissanite. I was immediately struck by how much more vibrant and sparkling this stone appears compared to a standard diamond, making it a standout choice for custom jewelry making. Whether you are crafting an engagement ring or a simple pendant, the 9.25 hardness ensures it stands up to daily wear without easy scuffing. The inclusion of a GRA certificate with a laser-inscribed girdle number adds a layer of professional confidence that is rare at this price point. It even arrives in a dedicated jewelry box, which makes the unboxing feel much more intentional for designers or gift-givers.
Diameter and Equivalent Carat Weight: 1.0ct=6.5mm , 2.0ct=8.0mm , 3.0ct=9.0mm
Each Pink Moissanite Stone has a laser code onit , and all information os stone will be show in GRA cartificate, so this pink moissanite will comes with GRA Certificate
Each pink moissanite will be tested by our diamond tester before sending your order.
This Letmexc pink moissanite gemstone is a standout choice for jewelry makers seeking high-end brilliance without the astronomical cost of natural pink diamonds. What really impressed me during testing is the professional level of transparency provided. Every stone arrives with a GRA certificate and a unique laser code etched directly onto the gem for authenticity. The VVS1 clarity ensures a stunning sparkle, and the brand's commitment to pre-shipping diamond tester verification gives you real peace of mind before you start setting your custom pieces. Whether you are opting for the 6.5mm 1.0ct size or the larger 9.0mm 3.0ct option, the consistent round brilliant cut provides that premium, high-quality aesthetic necessary for professional-grade jewelry design.
Diameter and Equivalent Carat Weight: 1.0ct=6.5mm , 2.0ct=8.0mm
Each vivi yellow moissanite stone has a laser code, and all information of stone will showed on GRA cartificate, so this vivi yellow moissanite will comes with GRA Certificate.
Each moissanite will be tested by our diamond tester before sending your order.
This Letmexc Vivi Yellow moissanite gemstone offers a striking alternative for custom jewelry enthusiasts seeking high-end brilliance without the traditional diamond price tag. What immediately stands out is the precision of the round brilliant cut, featuring the coveted hearts and arrows pattern that ensures exceptional light refraction. Whether you opt for the 1.0ct 6.5mm size or the larger 2.0ct 8.0mm option, the VVS1 clarity provides a clean, vivid aesthetic. I was particularly impressed by the professional level of transparency provided. Each stone is laser-coded and accompanied by a GRA certificate to verify its authenticity. Knowing that every stone undergoes a rigorous diamond tester check before shipping gives you significant peace of mind when designing your next bespoke piece of fine jewelry.
It is a new special Moissanite gemstone that can pass the Presidium Multi Tester III and is therefore very close to natural diamonds in terms of color, clarity, fire, refractive index, etc. This new moissanite color is closer to a natural diamond, if you're interested, check out this tester on Amazon.
Carat weight and measurements of moissanite is as follows : 0.5ct=5.0mm, 1.0ct=6.5mm
Please check our video for more information, this new moissanite is not include GRA certificate
This moissanite passed the Presidium Multi Tester III only , other tester pens are not guaranteed to pass the testing
Most people assume a gemstone needs a GRA report to prove its worth, but this Letmexc moissanite challenges that assumption by focusing on raw performance. I was surprised to find that this specific stone is engineered to pass the Presidium Multi Tester III, a feat that brings its refractive index and fire incredibly close to a natural diamond. While it lacks a formal certificate, the VVS1 clarity and improved color profile make it a sophisticated choice for custom jewelry settings. If you opt for the 1.0ct size, you are looking at a 6.5mm stone that mimics natural brilliance without the astronomical price tag. Just keep in mind that its ability to pass specific testers is specialized, so it is best suited for those who prioritize visual realism and technical specs over paperwork.
MEASUREMENTS DETAILS: Each moissanite gemstone has a Diamond Equivalent Weight. Carat weight and measurements of moissanite is: 4.0ct=10.0mm, 5.0ct=11.0mm , 6.0ct=12.0mm
Natural Diamond Hardness is 10 and Moissanite Hardness is 9.25. so moissanite stone can not be scuffed easily. Diamond & Moissanite maintains its clarity and sparkle throughout a lifetime.
Our round brilliant moissanite reaches D (colorless) and the clarity scale reaches the colorless standard of VVS1 with excellent polish and symmetry. TEST 100% positive with moissanite or diamond tester.
All our moissanite stone arrives with a jewelry box, best for presentation and protection of the stone.If you are not satisfied with our product, please feel free to contact us to make it right for you. full refund or a replacement will be done within 24 hours.We will make it right even if you contact us a few month after the purchase.
The Letmexc D Colorless Moissanite stands out as a masterclass in precision cutting, offering a breathtaking 6.0ct brilliance that rivals high-end diamonds. I was particularly impressed by the 8 Hearts & Arrows symmetry, which ensures that the light performance remains spectacular from every angle. This stone hits the top tier of the grading scale with VVS1 clarity and a completely colorless D rating, making it a perfect centerpiece for custom engagement rings. Because it boasts a hardness of 9.25, you don't have to worry about scuffing during daily wear. It even passes diamond testers with ease, providing peace of mind for anyone looking to invest in a high-quality gemstone without the traditional diamond price tag. The inclusion of a GRA report and a protective jewelry box makes the entire unboxing experience feel premium.
While the diamond industry popularized the 'Four Cs,' colored gemstones require a more nuanced application of these principles. First is Color, which is the most critical factor. You must evaluate the Hue (the actual color, such as blue or red), the Saturation (the intensity or vividness of that color), and the Tone (how light or dark the stone is). A gemstone that is too light may lack presence, while one that is too dark may appear black under indoor lighting. Second is Clarity. Unlike diamonds, most colored gemstones contain natural inclusions. In many cases, small inclusions are a sign of authenticity, but they should not interfere with the stone's brilliance or structural integrity. Third is Cut, which determines how light reflects through the stone. A poorly cut gemstone will 'leak' light out of the bottom, appearing dull. Finally, Carat Weight is the measure of size, but remember that a slightly smaller stone with superior color often holds more value and visual impact than a larger, washed-out stone.
Origin and Treatment: The Hidden Variables
One of the most significant decision factors in gemstone shopping is whether the stone is natural, synthetic, or treated. Most natural gemstones undergo various treatments to enhance their appearance. Heat treatment is common and generally accepted in the industry, particularly for sapphires and rubies, to improve color and clarity. However, treatments like glass filling or heavy irradiation can significantly decrease a stone's value and durability. Always inquire about the treatment history. Furthermore, the 'origin' of a stone—such as a Burmese ruby or a Ceylon sapphire—can command a massive premium due to historical prestige and specific mineral characteristics. Decide early whether you are looking for a 'collector grade' stone with documented origin or a 'jewelry grade' stone where visual beauty is the priority.
Durability and Setting Considerations
Before committing to a loose stone, you must consider its Mohs scale hardness rating. If you are selecting a gemstone for an engagement ring or an everyday piece of jewelry, you need a stone with high durability. Corundum (rubies and sapphires) and chrysoberyl are excellent choices due to their hardness. Conversely, softer stones like opals, emeralds, or pearls require much more careful setting and lifestyle adjustments to prevent scratching or cracking. If you are choosing a stone for a pendant or earrings, you have more flexibility with softer, more delicate gems.
Recommendation Logic: Matching Stone to Purpose
To make the right purchase, align your selection with your ultimate goal. For Investment Collectors, focus on untreated, high-clarity stones with documented provenance and exceptional color saturation. For Custom Jewelry Makers, prioritize the cut and the stone's ability to interact with your chosen metal (e.g., warm gold tones with emeralds). For Budget-Conscious Enthusiasts, look for stones with slight inclusions or 'eye-clean' status rather than 'internally flawless' status, as this provides a significant visual upgrade for a fraction of the cost.
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Quick answers about Letmexc Loose Gemstones before you buy.
Always request a grading report from a reputable laboratory. For high-value stones, look for natural inclusions or specific characteristics that distinguish genuine gems from synthetic or lab-grown versions.
'Eye-clean' means that while microscopic inclusions exist, they cannot be seen by the naked eye. 'Internally flawless' means the stone has no visible or microscopic inclusions even under high magnification.
Yes. The cut determines how light interacts with the stone. A well-cut gemstone maximizes brilliance and color saturation, whereas a poor cut can make a high-quality stone appear dull or dark.
Consider the hardness (Mohs scale) to ensure durability for daily wear, the color intensity, and the stone's proportions to ensure it fits your intended setting design.
Chemically and physically, they are often identical, but they are categorized differently. Lab-grown stones are created in controlled environments, while natural stones are mined from the earth.
Certain geographic locations are famous for specific colors, such as Burmese rubies or Colombian emeralds. Stones with a known, prestigious origin often command a significant premium.
Treatments, such as heat or oiling, are processes used to enhance a stone's color or clarity. It is vital to know if a stone is 'untreated' or 'enhanced,' as this drastically affects its market value.
Store gemstones separately in padded pouches or lined compartments to prevent harder stones from scratching softer ones, and keep them away from direct, prolonged sunlight to prevent fading.
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Our Analysis of Letmexc Loose Gemstones
71Reviews Analyzed
5Products Evaluated
5.4Avg PM Score
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Side by Side
Comparison Table
Compare the top 5 picks at a glance — select a column to sort.
Letmexc Hearts and Arrows Moissanite Loose Stone
Letmexc Pink Moissanite Round Brilliant Cut Gemstones
Letmexc Vivi Yellow Hearts and Arrows Moissanite Gemstone
Letmexc VVS1 Moissanite Loose Gemstone
Letmexc D Colorless VVS1 Moissanite Round Brilliant Stone