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Highlights & Features
A masterpiece of clean lines. The striking emerald-cut moissanite draws the eye into a mesmerizing hall of mirrors. Set on a delicate band, it radiates vintage glamour and modern grace.
Specifications
| Center Stone | Premium Stdiam™ (D/VVS1) |
| Cut Style | Emerald Step Cut |
| Metal Options | 18K White Gold Vermeil (925 Silver) 18K Yellow Gold Vermeil (925 Silver) Solid 10K White Gold Solid 10K Yellow Gold Solid 14K White Gold Solid 14K Yellow Gold |
| Band Width | 1.6mm (Comfort Fit) |
| Plating Standard | 8-Layer 18K Gold Plated (2.5μm Thickness) Applies to vermeil options only. |
| Setting Type | Master-Hand Micro Setting (Secure Prongs) |
| Refractive Index | 2.65 - 2.69 (Outsparkles Diamond) |
| Skin-Friendly | 100% Lead-Free & Nickel-Free |
| Packaging | Signature Walnut Wood Box |
| Certification | GRA Authenticity Certificate Included |
Choose Your Metal
Swipe to compare →
18K
White Gold Vermeil
18K white gold over 925 sterling silver
The bright look of white gold at an accessible price.
The plating may wear over time, but the similar silver tone beneath makes color changes less noticeable.
BRIGHT WHITE · EVERYDAY VALUE
18K
Yellow Gold Vermeil
18K yellow gold over 925 sterling silver
A beautiful, affordable way to enjoy the rich look of gold.
The gold plating may gradually fade with wear, revealing the silver beneath.
RICH GOLD TONE · EVERYDAY VALUE
10K
Solid White Gold
Solid 10K white gold throughout
A lasting choice for everyday wear, with white gold all the way through.
The surface brightness may soften with wear; beneath the finish, it is still white gold.
SOLID GOLD · WHITE GOLD THROUGHOUT
10K
Solid Yellow Gold
Solid 10K yellow gold throughout
Warm gold color that comes from the metal itself.
As the surface wears, the metal beneath retains its gold tone, with no silver base to show through.
SOLID GOLD · LASTING GOLD TONE
Not sure about your size?
✓If you're between sizes, choose the half size up for comfort
✓Standard US sizing with EU / UK conversion reference
✓Free resizing within 30 days for peace of mind
✓Standard US sizing with EU / UK conversion reference
✓Free resizing within 30 days for peace of mind
Find your closest match using the chart below.
| US / CA MX |
UK / AU IE / NZ / ZA |
FR | DE / RU UA / Asia |
IN / CN / JP SA / TR / IL |
IT / ES NL / CH |
DIA (mm) |
CIRC (mm) |
|---|---|---|---|---|---|---|---|
| 4 | H ½ | 47 | 14.9 | 7 | 7 | 14.9 | 46.8 |
| 4.5 | I ½ | 48 | 15.3 | 8 | 8 | 15.3 | 48.0 |
| 5 | J ½ | 49 | 15.7 | 9 | 9 | 15.7 | 49.3 |
| 5.5 | L | 51 | 16.1 | 11 | 11 | 16.1 | 50.6 |
| 6 | M | 52 | 16.5 | 12 | 12 | 16.5 | 51.9 |
| 6.5 | N | 53 | 16.9 | 13 | 13 | 16.9 | 53.1 |
| 7 | O | 54 | 17.3 | 14 | 14.5 | 17.3 | 54.4 |
| 7.5 | P | 56 | 17.7 | 15 | 16 | 17.7 | 55.7 |
| 8 | Q | 57 | 18.1 | 16 | 17 | 18.1 | 57.0 |
| 8.5 | Q ½ | 58 | 18.5 | 17 | 18 | 18.5 | 58.3 |
| 9 | R ½ | 59 | 18.9 | 18 | 19 | 18.9 | 59.5 |
| 9.5 | S ½ | 61 | 19.4 | 19 | 21 | 19.4 | 60.8 |
| 10 | T ½ | 62 | 19.8 | 20 | 22 | 19.8 | 62.1 |
Fit Tip: If your knuckle is noticeably larger than the base of your finger, we recommend measuring both and choosing a size in between to ensure the ring slips on comfortably.
→ View Full Size Guide & Measure Tips
If it’s not quite right, our hassle-free exchange makes it effortless to get the one that is. We offer ONE FREE RESIZING within 30 days of purchase.
Shipping & Crafting
Crafting Time
Most standard whole sizes (5–9) are crafted within
5–7 business days
.
For the best fit, half sizes and sizes 4, 10 & 11 require additional sizing and finishing steps and typically take 10–15 business days .
For the best fit, half sizes and sizes 4, 10 & 11 require additional sizing and finishing steps and typically take 10–15 business days .
Free Standard Shipping
Worldwide · 150+ countries
7–12 Business Days
VIP Shipping
Available at checkout · $14.90
4–7 Business Days
Delivery estimates apply after dispatch. Crafting time is separate from shipping time.
Risk-Free Purchase
30-Day Returns & Exchanges
Returns and exchanges available within 30 days of delivery.
Lifetime Stone Guarantee
Your center Moissanite is guaranteed for life and will never lose its brilliance.
2-Year Craftsmanship Warranty
Every piece is protected against verified manufacturing defects.
*Note: Excludes normal wear, accidental damage, lost items, and third-party modifications.
Crafted by Masters. Engineered Beyond Tradition
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Moissanite Guide
Moissanite, Explained.
Clear answers to the questions shoppers ask most about moissanite, from durability and brilliance to long-term care.
Is moissanite a real gemstone or a fake diamond?
Moissanite is a real gemstone with its own chemical composition and optical properties. It is not a type of diamond or a fake diamond.
Modern jewelry-grade moissanite is lab-created for consistency and clarity, with a distinctive brilliance and fire of its own.
What is the difference between moissanite and diamond?
Moissanite and diamond are different gemstones. Diamond is carbon, while moissanite is silicon carbide.
Visually, moissanite often displays more colorful fire, while diamond has its own characteristic balance of white brilliance and dispersion. Both can appear bright and refined, but their optical character is not identical.
Is moissanite durable enough for everyday wear?
Yes. Moissanite measures approximately 9.25 on the Mohs hardness scale, making it highly resistant to scratching and well suited to regular wear.
As with all fine jewelry, the setting and metal should still be protected from hard impacts, abrasive surfaces and strenuous activities.
Does moissanite get cloudy or lose its brilliance over time?
Moissanite does not normally become permanently cloudy with wear. Oils, lotions, soap and everyday residue can temporarily soften its sparkle.
Gentle cleaning can restore its clarity and brilliance, while regular care also helps keep the surrounding metal and settings looking their best.
How should I clean and care for moissanite jewelry?
Clean moissanite jewelry with lukewarm water, mild soap and a soft brush, then rinse thoroughly and dry with a soft, lint-free cloth.
Pay particular attention to the underside of stones and around settings where residue may collect. When not being worn, store your piece separately in its original STDIAM walnut wood box to help reduce contact and rubbing against other jewelry.
For more detailed guidance, visit the STDIAM Jewelry Care Guide .
Why is moissanite more affordable than diamond?
Moissanite follows a different production, supply and pricing structure from diamond. Because jewelry-grade moissanite can be created in a controlled laboratory environment, it can offer substantial visual presence and durability at a lower price point.
The lower price does not make it a lower-quality version of diamond. It is a different gemstone category with its own characteristics.
Can people tell the difference between moissanite and diamond?
The difference can be subtle at a glance, especially once a stone is set in jewelry, but moissanite and diamond are not visually identical.
Moissanite generally shows stronger spectral fire, while diamond has its own characteristic pattern of brilliance. Cut, stone size and lighting can all influence how noticeable those differences appear.
Is moissanite suitable for engagement rings and meaningful jewelry?
Yes. Moissanite combines high durability, distinctive brilliance and a wide range of cuts and settings, making it suitable for engagement rings as well as jewelry chosen for anniversaries, milestones, gifting or everyday wear.
Ultimately, the right choice comes down to the design, materials and character that feel right for you.
M
Este anillo es genial perfecto para regalar a esa persona especial para nuestras vidas o simplemente como un buen detalle para lucir con estilo y elegancia definitivamente lo recomiendo
M
Very comfortable and looks great paired with a gold band. This cut doesn’t show the rainbow effect of the gem as much as other round cuts, which is great!
L
The ring is perfect!! Quality is amazing! I feel the ring is true to size and is a great fit! The carat weight is on point with the description! 1000% recommend if emerald cut is your style!
3
Admittedly when I first opened the box, I thought the stone looked smaller than 3.5 carats but as soon as I put it on my hand my opinion changed. The moissanite is really clear and high quality and comes with a certification as well. It isn't as rainbowy as some stones can get and honestly looked really similar to a diamond. Emerald cuts aren't meant to sparkle in the same way as a round cut diamond, and kind of flashes when the light hits it if it makes sense. It's an understated shine and honestly really elegant. I bought this to be a travel ring because I can't be trusted not to lose my actual wedding rings when I'm traveling. While $130 is no small amount, the quality is there. I feel much more confident traveling with this than I do my actual ring and it's fun to wear something different as well. My actual ring is a round stone, but I was torn with an emerald cut and I love that I have it now. This gives me the best of both worlds.
M
This ring is beautifulllllllllll quality is amazing
M
Good
R
I wanted a ring to take to vacations and such where I won’t be comfortable taking my diamond rings and this is such a good quality ring. The shine and color is very nice too.
N
This is a pretty ring. Love the full round band. It seems to be made well but the gold plating is too yellow for me and it doesn't seem like a 3.5ct.
T
This ring is gorgeous! Somehow the design is all at once eye catching and simplistic. I’ll have to see how it holds up long term but as of day one: it’s lovely, lightweight, good quality and just understated enough to seem like the real deal.
C
Stdiam 3ct Elongated Emerald Cut Moissanite Engagement Ring (yellow gold, size 8) has surprised me in a good way. The description pic #5 is a great representation of how the stone looks. I have not seen a stone cut like this one before. I like it! The band and setting are plain, which is a pretty contrast to the clear, sparkly moissantie. I’m not a huge fan of yellow gold, but this works. I would like this ring much better if it were white gold, platinum, or 925 SS. The ring does run big, about a 1/25 - ½ size. This would make a great gift for self and others, and a beautiful engagement/promise ring.
A
This ring comes in a beautifully cushioned box with a GRA Moissanite Report and velvet bag. The elongated emerald cut is brilliant in person, with a shape that you can admire from every angle. The band has a smooth, comfortable feel that allows it glide easily across my finger with a high polish that announces its elegance at a quick glance. The prong setting stands just high enough to be noticed, but sits low enough that it doesn't bother those that regularly work with their hands. I personally feel like this is of exceptional quality and Stdiam is the name that I look for when choosing an elegant Moissanite piece of jewelry.
A
This is a beautiful 3.5CT Emerald Cut Moissanite Ring. It has 14K gold plating over 925 Sterling Silver on the band. The center stone is beautiful and sparkly, my pictures do not do it justice for how stunning it is in person. The price is reasonable especially for those, like me and my fiancé, that are on a very tight budget. Without breaking the bank, this engagement ring looks like it did.
C
This is a gorgeous cubic zirconia engagement band by Stdiam!I ordered a size 7 and it fits true to size. I needed a replacement engagement band while my diamond engagement ring gets repaired. I'm so happy I got this, because it's extremely shiny and bright and we need to have our, and I get tons of compliments on it!
K
This Stdiam engagement ring is absolutely breathtaking! The 3ct elongated emerald cut moissanite is stunning, sparkling with incredible brilliance and fire. The D color and VVS1 clarity truly make it look like a high-end diamond. The 925 sterling silver solitaire setting is beautifully crafted and complements the stone perfectly. It's an elegant and timeless piece that looks far more expensive than it is. Highly recommend for a gorgeous and ethical engagement ring!
T
The ring is beautiful. It has lots of sparkle. The gold is very shiny. It is a large stone and it is noticeable. It comes with certificates and a nice soft fabric bag. The ring is very elegant and is great for a promise ring or formal events. It is made very well and is good quality.
R
I wore this ring to an event today and everyone was complimenting it and congratulating my husband for buying me such a lovely diamond. I didn’t have the heart to tell anyone that it wasn’t real.
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