Unique Engagement Rings: Opal, Alexandrite and Moissanite Rings (BBBGEM Guide)

Updated October 14, 2026 · Prices and offers checked October 14, 2026

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BBBGEM opal twisted engagement ring with moissanite halo

A colored gemstone makes an engagement ring one of a kind, and moissanite side stones keep the sparkle without the price of diamonds. Here are BBBGEM's most distinctive rings (opal, moss agate, alexandrite, aquamarine and emerald) compared by stone, style and price, with the codes that take $50 or 10% off.

Quick picks

Best for…	Pick	Size	Price today
Fire and color	Opal twisted halo	1.5 ct oval	$1,234.00 $1,110.60 with our code
Nature lovers	Moss agate halo	1.5 ct oval	$1,110.00 $1,060.00 with our code
Color-change magic	Alexandrite 5-stone	lab alexandrite	$1,015.00 $965.00 with our code
Vintage	Emerald Art Deco	5 mm round	$1,045.00 $995.00 with our code
Something blue	Aquamarine halo	oval	$1,292.00 $1,242.00 with our code
Dark and dramatic	Black opal pear halo	1.25 ct pear	$1,132.00 $1,018.80 with our code

BBBGEM offers today

$50
off

$50 off halo rings over $300 (until Nov 26)

Show code

$50
off

$50 off Art Deco rings over $300 (until Nov 6)

Show code

See all BBBGEM offers

How to choose a unique engagement ring

Moissanite or diamond side stonesEvery ring here starts with moissanite side stones in 10k gold; the same designs with natural diamonds cost several hundred dollars more, and 14k or 18k gold costs more again.

Softer stones need careOpal and moss agate are softer than sapphire or diamond, so they suit careful everyday wear; a halo setting helps protect the center stone.

Pick the right code: each ring shows the code that saves the most: $50 off halo or Art Deco rings, or 10% off opal rings (more than $50 on any opal ring over $500).

Best unique engagement rings

Most unique

Fire and color

BBBGEM 1.5CT Oval Opal Twisted Engagement Ring with Halo

6x8 mm oval opalmoissanite or diamond halotwisted band

A shimmering oval opal in a sparkling halo on a twisted band, in yellow, rose or white gold.

$1,234.00

About $1,110.60 with our 10% opal code

Show code & shop

Nature lovers

BBBGEM 1.5CT Oval Moss Agate Engagement Ring with Diamond Halo

6x8 mm moss agatehaloone of a kind inclusions

An oval moss agate with green, plant-like inclusions, so no two rings look the same, set in a sparkling halo.

$1,110.00

About $1,060.00 with our $50 halo ring code

Show code & shop

Color-change magic

BBBGEM Alexandrite 5-Stone Engagement Ring

5 lab-created alexandritesgreen to purplish-red10k-18k gold

Five oval lab-created alexandrites that shift from green to purplish-red under different light.

$1,015.00

About $965.00 with our $50 fine jewelry code

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Moonstone glow

BBBGEM 1.5CT Oval Moonstone Ring with Alexandrite Side Stones

oval moonstonecolor-change alexandrite10k-18k gold

A glowing oval moonstone with color-change alexandrite side stones that shift from green to purple.

$1,176.00

About $1,126.00 with our $50 fine jewelry code

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Vintage

BBBGEM Round Emerald Art Deco Engagement Ring

5 mm round emeraldArt Deco settingrose, yellow or white gold

A vibrant green emerald framed in a diamond-studded Art Deco design, for a vintage look.

$1,045.00

About $995.00 with our $50 Art Deco code

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Something blue

BBBGEM Oval Aquamarine Engagement Ring with Mixed-Cut Halo

oval aquamarinemixed-cut haloocean blue

A calm blue aquamarine surrounded by a halo of mixed-cut stones, for an ocean-inspired ring.

$1,292.00

About $1,242.00 with our $50 halo ring code

Show code & shop

Dark and dramatic

BBBGEM 1.25CT Pear Black Opal Half-Eternity Halo Ring

6x8 mm pear black opalhalf-eternity bandhalo

A pear-shaped black opal with vivid color play, in a halo on a half-eternity band.

$1,132.00

About $1,018.80 with our 10% opal code

Show code & shop

Ways to pay less at BBBGEM

1. $50 off halo and Art Deco ringsTwo codes take $50 off halo rings (until Nov 26) and Art Deco rings (until Nov 6) over $300.

2. 10% off opalA 10% code works on rings and sets with opal as the main stone.

3. Moissanite saves hundredsChoosing moissanite side stones instead of diamonds lowers the price by several hundred dollars on most designs.

See all BBBGEM coupons and deals

FAQ

What makes an engagement ring unique?

A colored center stone (opal, moss agate, alexandrite, aquamarine or emerald) and a distinctive setting, like a twisted band or Art Deco frame. BBBGEM makes all of these in gold with moissanite or diamond accents.

Is moissanite good for an engagement ring?

Moissanite is hard and very sparkly, which is why it's a popular, lower-cost alternative to diamond; BBBGEM uses it for the side stones on these rings by default.

Are opal engagement rings durable?

Opal is softer than diamond or sapphire, so it needs a little more care: avoid knocks and harsh chemicals. A halo setting helps protect the stone.

What is an alexandrite ring?

Alexandrite changes color with the light, from green to purplish-red. BBBGEM's 5-stone ring uses lab-created alexandrites.

Is there a BBBGEM coupon code?

Yes: $50 off halo and Art Deco rings over $300, 10% off opal rings and $50 off fine jewelry. Tap Show code in the offers box.

Product details and US prices (10k gold with moissanite, the lowest option) from BBBGEM's website, checked October 14, 2026. Codes from BBBGEM through our affiliate network and our BBBGEM store page. Prices change; the final price is shown at checkout.