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Eilwen Marquise Lab-Grown Blue Sapphire Leaf Engagement Ring in Black Ruthenium

$175.00

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Gemstone: Blue Sapphire

Metal Type: Black Ruthenium

Size: 4

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Size Chart

Find your ring size

Print at 100% / Actual Size — turn off "fit to page" or scaling.
Check the printed ruler measures exactly 80 mm.

Method A — Measure a ring

Lay a ring you own over the circles. The matching circle is your size.

Method B — Finger strip

Cut out the strip, wrap it around your finger, thread the end through the slit, and read your size.

Open the printable sizer (PDF)

1. Calibrate your screen — pick a reference object, hold it against the outline, and drag until the widths match exactly. On a phone, a coin is easiest — a card is often wider than the screen.

Bank card — hold vertically

2. Match a ring you own — drag until the circle fits just inside one of your rings.

US 6 · 16.5 mm · UK L½ · EU 52

This on-screen tool is a close guide, not a guaranteed exact fit. For certainty, order a ring sizer.

US	Diameter	Circumf.	UK/AU/IE	EU

UK, Australia & Ireland share the letter system. European sizes are approximate conversions.

In Stock Free Delivery Est. Nov 1

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Product Description

An elven leaf engagement ring in black. A tall 5 × 15 mm marquise of lab-grown blue sapphire sits north to south between simulated diamond leaves, on a split shank of solid 925 sterling silver with a black ruthenium finish.

Lab-Grown Blue Sapphire Marquise Cut, 5 × 15 mm Simulated Diamond Leaves Split Shank Black Ruthenium Finish Sizes 4–11

The Design

Eilwen is a Welsh name meaning fair and white, and the ring is built tall and slender to match. A 5 × 15 mm marquise sits north to south in six prongs, three times as long as it is wide, so it runs up the finger like a leaf on its stem. A marquise-cut simulated diamond leaf flanks each shoulder with a smaller leaf behind it, and the band splits as it reaches the stone, with a line of round simulated diamonds on each side. Our marquise engagement rings guide covers why the cut reads larger and longer than its carat weight.

The silhouette belongs to the elven and fairy-tale lane we cover in fairy engagement rings and fantasy engagement rings; for the wider field, non-traditional engagement rings.

The Blue Sapphire

The center stone is lab-grown sapphire: genuine corundum, grown in a laboratory, with the same chemistry, hardness and royal blue as a mined sapphire. It is cut as a long marquise, 5 × 15 mm, three times as long as it is wide, and set with the points running along the finger. Sapphire is 9 on the Mohs scale and the September birthstone.

Our sapphire engagement rings guide covers lab-grown against mined and what to look for in the color, and the blue gemstones guide places sapphire beside the other blue stones.

Metal and Stones

The ring is solid 925 sterling silver with a black ruthenium finish, a platinum-group metal that settles to a deep gunmetal rather than a flat black. Against it the blue reads deeper than it would on silver and the white leaves read brighter.

The center marquise is lab-grown sapphire. The leaf-shaped marquises on the shoulders and the small rounds along the shank are simulated diamond (cubic zirconia). Our moissanite vs cubic zirconia post explains what that material does well and where it falls short of a mined stone.

Part of our sapphire engagement rings, marquise engagement rings, leaf engagement rings, fairy engagement rings, gothic engagement rings and September birthstone collections, alongside the rest of our black ruthenium jewelry and blue gemstone jewelry.

Specifications

Center stone: Lab-grown blue sapphire, marquise cut, 5 × 15 mm
Accent stones: Simulated diamond (cubic zirconia) marquises and rounds
Metal: Solid 925 sterling silver, black ruthenium finish
Setting: Six-prong marquise, north to south, on a split shank
Hardness: Sapphire, 9 on the Mohs scale
Birthstone: September
Sizes: 4 to 11, including half sizes
Engraving: Available, up to 16 characters
Presentation: Free luxury velvet jewelry box

Care

Sapphire is 9 on the Mohs scale and well suited to daily wear, so the ruthenium finish is the part to protect. Clean with warm water, mild soap and a soft brush, working the brush around the leaves where lotion collects, then dry before storing. No silver polishing cloths or abrasive compounds, which thin the black ruthenium; avoid ultrasonic cleaners and household chemicals for the same reason. Store the ring in its velvet box rather than loose.

Frequently Asked Questions

Is the sapphire real?

It is lab-grown sapphire: real corundum with the same chemistry, hardness and color as a mined sapphire, grown in a laboratory rather than dug up. It is not a simulant.

What color is the stone?

A deep royal blue. Against the black ruthenium it reads darker and richer than it would on silver, with a brighter flash in daylight.

Is sapphire hard enough for an engagement ring?

Yes. Sapphire is 9 on the Mohs scale, harder than everything except diamond and moissanite, and it suits daily wear. The ruthenium finish, not the stone, is the part to protect.

Is sapphire a birthstone?

Yes. Sapphire is the September birthstone.

How dark is the black ruthenium finish?

Ruthenium settles to a deep gunmetal rather than a flat jet black. The slight reflectivity keeps the leaves and the split shank visible instead of flattening them.

What is the ring made of?

Solid 925 sterling silver with a black ruthenium finish. No brass or base metal.

How big is the center stone?

5 × 15 mm, marquise cut, set north to south so the length runs along the finger. It is three times as long as it is wide, which is what gives the ring its tall, slender look.

What are the leaf-shaped side stones?

Simulated diamond, which is cubic zirconia. Two marquise leaves sit on each shoulder and a line of small rounds runs down each side of the split shank.

Can I have it engraved?

Yes. Engraving is available on the inner band, up to 16 characters, and can be added as an option at checkout.

What sizes are available?

Sizes 4 through 11, including every half size.

Does it come with a ring box?

Yes. Every order arrives in a free luxury velvet jewelry box.

Are the stones ethically sourced?

Yes. All Aquamarise stones are conflict-free and responsibly sourced.

Properties of Sapphire

Shipping & Delivery

Engraving

Shop the Look

Free US shipping

Free size exchanges

Ethically sourced

Free ring box

Black ruthenium marquise amethyst engagement ring and matching amethyst inlay band framed by lilac mesh ribbon, Aquamarise vertical couples ring banner

Black Rings for Women

The same charcoal-gunmetal finish across engagement rings, stacking bands and matching sets — every one plated over solid 925 sterling silver. Shopping for him? Our men’s black rings add tungsten and titanium, which hold their color harder than any plating.

Shop the collection

Free U.S. Shipping + Worldwide Delivery

Ethically Sourced Gemstones

Handcrafted by Aquamarise®

Complimentary Engraving on Every Order

Free U.S. Shipping + Worldwide Delivery

Ethically Sourced Gemstones

Handcrafted by Aquamarise®

Complimentary Engraving on Every Order

What Makes Aquamarise® Different

Two rings with blue stones on a gray stone surface

Ethically Sourced, Always

Each gemstone is meticulously hand-selected for its brilliance and clarity, responsibly sourced from trusted partners around the world.

Built to Be Worn, Not Just Admired

Every piece is expertly crafted and finished to endure daily wear, combining lasting strength with enduring beauty beyond the display case.

Specifically Designed for You

Every Aquamarise® creation is thoughtfully designed for those who view jewelry as a personal expression. Never mass-produced, each piece carries a sense of meaning and individuality.

Crafted to Last. Not Just Sparkle.

While most jewellers focus on appearance, Aquamarise® focuses on craftsmanship, durability, and pieces you will treasure forever.

		Others
Premium Materials
Personalized Engraving
Craftsmanship Guarantee
Ethically Sourced Gemstones
Luxury Gift Packaging

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Frequently Asked Questions

Ruthenium is a platinum-group metal — the same family as platinum, palladium and rhodium — and one of the rarest elements in the earth’s crust. It is extremely hard but also brittle, which is why it is used as a finish rather than a solid metal: here it is electroplated over a solid 925 sterling silver base and tuned toward a smoky, near-black tone.

Despite the name it is not a flat jet black. It reads deep charcoal in daylight and near-black in low light, which is what makes stones and carved detail feel dimensional. Our full guide, What Is Black Ruthenium?, covers the science — or browse the whole black ruthenium collection.

Honestly: it is durable, but it is not permanent — no plated finish is. Ruthenium is one of the harder platings available and resists corrosion well, but it wears gradually at high-friction points, most often the inside of the shank, where brighter silver can begin to show through. Friction, moisture and skin chemistry decide how quickly.

That is expected rather than a fault, and many people like the lived-in, antique-blackened character it develops. The finish can also be professionally stripped and re-plated, because the sterling silver structure underneath stays intact. If you want a dark ring whose color barely changes, our black tungsten and titanium bands are coated rather than plated and hold their tone harder than any plating.

For most people, yes. Ruthenium is a platinum-group metal and is nickel-free, chemically stable and corrosion-resistant, so it rarely reacts with skin.

Because any plating is thin, the metal underneath matters too — if a finish wears through, skin can contact the base. Here that base is 925 sterling silver, which is itself nickel-free, so both the surface and the metal beneath are skin-friendly. Our Precious Metal Guide compares the options if you are highly nickel-sensitive.

They are platinum-group cousins, both electroplated, so the differences are real but subtle. Ruthenium is generally the harder of the two, so on a ring worn daily it tends to hold up marginally longer at the contact points. Black rhodium reads a touch cooler and closer to true black, and it is the more expensive metal.

If you want the deepest possible black, rhodium has a slight edge on color. If you want hardness and value, ruthenium is hard to beat. Our materials guide sets the two side by side.

Measure at home with our Ring Size Chart, or use the Find my ring size link beside the Add to Cart button. If you are between sizes, size up.

If the fit is not right when it arrives, size exchanges are free — send it back within 30 days unworn and in original condition and we will send the correct size out. No fee, no forms. Engraved rings are the one exception, as each is cut specifically for you. Full terms are on our Returns & Refunds page, and every ring is covered by our warranty against manufacturing defects.

Warm water, a drop of mild soap and a soft cloth; dry it thoroughly before it goes away. Put it on last — after perfume, lotion and hairspray — and take it off before swimming, showering, exercising, gardening or cleaning.

Skip abrasive polishes and silver dips. Those are made for untreated silver and will grind through a thin plated layer rather than clean it, and ultrasonic and steam cleaners can lift a plated surface for the same reason. Store each piece dry, in a pouch or lined box, away from harder stones. Our Jewelry Care Guide has the full routine.

On most designs, yes — where engraving is available, a text field appears with the options above. Standard laser engraving is complimentary: up to 16 characters on women’s rings and 25 on men’s, set in Arial, with a selection of symbols included at no extra cost. Custom fonts and symbols are $25 and are arranged before you order.

See the Engraving page for examples. Engraved rings are final sale, so check your wording carefully — we engrave exactly what is entered.

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