Where do our diamonds come from?

Designs in the collection are available in the following diamond and gemstone shapes: round brilliant, cushion, oval, emerald, pear, princess or square, marquise, Asscher, radiant, heart, hexagonal and even antique cuts like rose cut, old mine cut and Old European cut diamonds. We source diamonds globally from diamond manufacturers that comply with the United Nations Kimberley Process in order to affirm all of our diamonds are ethically sourced. To learn more about the different sources of diamonds, from lab-grown diamonds to CanadaMark, visit our ethical engagement ring page .

How do you figure out you or your partner's ring size?

You’ve decided to pop the question and take the first step to spending the rest of your life together, but what ring size is my partner?! We have some invaluable advice for choosing that perfect ring available on our ring size guide – even if you’re planning a surprise proposal.

Do we get inspired by celebrity engagement rings?

Engagement rings are so special because they’re more than just a jewelry purchase. They’re a tangible mark of the intention to get married, while a wedding ring symbolizes the union. We understand how sentimentally valuable an engagement is and we love that this symbol of commitment can be so personal to each couple. As designers, we’ve always looked to the high-profile jewelry of celebrities, royals, and cultural icons to kickstart our creativity. And lots of our customers feel the same! Browse through our collection of celebrity engagement ring guides to how you can incorporate some new ideas into a design that suits your price point. Additionally, we’ve collected some of the most popular bespoke designs from our Instagram page into one place so that you can get the design ideas flowing. Browse our ‘As Seen on Instagram’ page here .

Platinum Round Diamond Engagement Rings

Drawing together timeless design with modern artistry, our collection of platinum round diamond engagement rings offers you an exciting selection of unique rings, allowing you to find a design that speaks to love you share with your partner. Certain styles determine the overall silhouette and impact of your engagement ring, so take time to consider if a solitaire, pavé, halo, or trilogy design is the one for you. Best known for their brightness and brilliance, a round diamond is a time-honoured diamond shape for an engagement ring as its versatile circular shape suits all styles and metals. Our designers draw creative inspiration from all over to bring you a diverse range of platinum round diamond engagement rings, so explore our full selection of design styles below.

105 rings found

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Taylor & Hart Eve Round Engagement Ring 360 detail 01

Eve

Round solitaire engagement ring with six eagle claws set in platinum

from $1,155

Cassia

Round solitaire engagement ring with twisted 3/4 eternity flat band set in platinum

from $1,680

Marula

Round center framed by round diamond clusters engagement ring set in platinum

from $1,960

Faith

Trilogy engagement ring with round center diamond and teal sapphire sides

from $1,470

Hope

Round diamond four-prong solitaire engagement ring set in platinum

from $1,015

Dulcet

Round diamond center and fishtail pavé diamond band engagement ring set in platinum

from $1,365

Marula

Round center framed by round pink sapphire and diamond clusters engagement ring set in platinum

from $1,960

Faith

Trilogy engagement ring with round center diamond and pear diamond sides

from $1,470

Lierre

Round organic green sapphire and diamond detail engagement ring in platinum

from $1,610

Faith

Trilogy engagement ring with round center diamond and blue sapphire sides

from $1,470

Tamora

Round center engagement ring with marquise green sapphire petals on a knife edge band

from $1,715

Serendipity

Round center and pavé band engagement ring set in platinum

from $1,645

Thia

Round center engagement ring with marquise diamonds set in platinum

from $1,780

Thia

Round center engagement ring with marquise diamonds set in platinum

from $1,550

Grace

Round diamond solitaire engagement ring set in platinum

from $1,120

Faith

Trilogy engagement ring with round center diamond and purple sapphire sides

from $1,470

Lierre

Round organic sapphire and diamond detail engagement ring in platinum

from $1,610

Splendor

Round diamond center and pavé diamonds engagement ring set in platinum

from $1,785

Elysium

Round diamond solitaire engagement ring set in platinum

from $1,120

Demure

Round diamond solitaire engagement ring set in platinum

from $945

Affinity

Round diamond center and pear side diamonds engagement ring set in platinum

from $1,960

Thia

Round center engagement ring with marquise green sapphires set in platinum

from $1,550

Venus

Round diamond trilogy with round prongs engagement ring set in platinum

from $2,555

Lierre

Round organic diamond detail engagement ring in platinum

from $1,610

Tamora

Round center and marquise diamond petals on a knife edge band

from $1,715

Tranquility

Round center diamond and round side blue sapphire trilogy engagement ring set in platinum

from $2,030

Tamora

Round center engagement ring with marquise dark blue sapphire petals on a knife edge band

from $1,715

Allure

Round diamond center and pavé diamond halo engagement ring set in platinum

from $2,065

Thia

Round center engagement ring with marquise green sapphires set in platinum

from $1,780

Tranquility

Round center diamond and round side ruby trilogy engagement ring set in platinum

from $2,030

Tranquility

Round center and side diamond trilogy engagement ring set in platinum

from $2,030

Thimble

Round diamond trilogy with filigree basket engagement ring set in platinum

from $1,470

Hana

Round diamond solitaire engagement ring with cherry blossom and asymmetrical prongs

from $1,505

Faith

Trilogy engagement ring with round center diamond and peach sapphire sides

from $1,470

Marula

Round center framed by round blue sapphire and diamond clusters engagement ring set in platinum

from $1,960

Cardamom

Round solitaire engagement ring with twisted pavé band engagement ring set in platinum

from $1,925

Lantana

Round engagement ring framed by marquise diamond clusters engagement ring set in platinum

from $1,680

Purity

Round diamond solitaire bezel engagement ring set in platinum

from $1,260

Sage

Round center hidden halo engagement ring with diamond pavé collar

from $1,365

Lissome

Round diamond center and pavé diamond band engagement ring set in platinum

from $1,225

Divinity

Round diamond center and prong-set diamonds engagement ring set in platinum

from $1,260

Taylor & Hart Joy Round Engagement Ring 360 detail 01

Joy

Round diamond four-prong solitaire engagement ring set in platinum

from $1,190

Lunarose

Round diamond floral cluster engagement ring with pink sapphire and diamond ombré in platinum

from $3,710

Adore

Round center and pavé diamond halo engagement ring set in platinum

from $1,645

Sonder

Round diamond center and bead-set diamonds engagement ring set in platinum

from $2,065

Talisman

Round center and bead-set diamond halo engagement ring with hand-applied milgrain details

from $2,310

Bliss

Round diamond four-claw solitaire and pavé diamond gallery engagement ring

from $1,470

Neptune

Round solitaire engagement ring with milgrain and pavé diamond halo and pavé band

from $2,135

Thyme

Round solitaire engagement ring with hidden diamond halo and pavé band

from $1,925

Aflutter

Round diamond center and pavé diamond double halo engagement ring set in platinum

from $2,240

Aurora

Round center and fishtail diamond pavé band engagement ring

from $2,065

Besso

Round diamond and a 0.80ct round blue sapphire engagement ring with sapphire and diamond ombré side stones

from $4,495

Lunarose

Round diamond floral cluster engagement ring with diamonds in platinum

from $3,710

Faith

Trilogy engagement ring with round center diamond and green sapphire sides

from $1,470

Genesis

Round center with double pavé halo engagement ring, inner halo set with blue diamonds

from $15,195

Eden

Round diamond four-prong solitaire engagement ring set in platinum

from $1,155

Affinity

Round diamond center and pear side blue sapphires engagement ring set in platinum

from $1,960

Lyra

Round diamond center and floral diamond halo engagement ring set in platinum

from $1,890

Eclipse

Round diamond solitaire engagement ring with fern detail and star set diamonds in platinum

from $3,115

Utopia

Round diamond center and tapered baguettes engagement ring set in platinum

from $2,590

Mirror

Round diamond art deco trilogy engagement ring with tapered baguettes

from $1,575

Nouveau

Art Nouveau inspired round diamond solitaire engagement ring set in platinum

from $1,190

Aria

Round diamond center and bead-set diamond band engagement ring set in platinum

from $1,785

Lierre

Round organic ruby detail engagement ring in platinum

from $1,610

Symphony

Round solitaire and pavé diamond split-shank engagement ring

from $2,065

Comet

Art Deco inspired round solitaire engagement ring with bead-set diamond pavé

from $1,995

Fleur

Round diamond center and pavé diamond flower halo engagement ring set in platinum

from $1,715

Sirius

Round diamond solitaire bezel engagement ring set in platinum

from $1,680

Dawn

Round diamond center and fishtail pavé diamond halo engagement ring set in platinum

from $1,960

Tamora

Round center engagement ring with marquise purple sapphire petals on a knife edge band

from $1,715

Damson

Round solitaire engagement ring with blue sapphire and diamond ombré pavé

from $1,365

Faith

Trilogy engagement ring with round center diamond and pink sapphire sides

from $1,470

Infinity

Round center diamond and pavé diamond halo engagement ring set in platinum

from $2,310

Athena

Round center with baguette side diamonds and pavé diamond band

from $3,710

Artemis

Round center with round and baguette diamonds and Art Deco inspiration

from $2,345

Thia

Round center engagement ring with marquise rubys set in platinum

from $1,780

Cosmic

Round diamond center and channel-set diamonds engagement ring set in platinum

from $1,995

Sugar

Round solitaire engagement ring in a prongless setting with diamond halo

from $1,680

Stella

Round diamond center and pavé diamond double halo engagement ring set in platinum

from $3,220

Entwine

Round diamond center and twisted pavé diamond halo engagement ring set in platinum

from $2,170

Encircle

Round center and bead-set diamonds with Art Deco hexagonal motif

from $2,135

Constellation

Round diamond center and pavé diamonds engagement ring set in platinum

from $1,785

Coast

Round center engagement ring with rising halo and bevelled pavé band

from $2,275

Faith

Trilogy engagement ring with round center diamond and yellow sapphire sides

from $1,470

Lyra

Round solitaire engagement ring with floral blue sapphire halo

from $1,890

Thia

Round center engagement ring with marquise purple sapphires set in platinum

from $1,550

Damson

Round solitaire engagement ring with pink sapphire and diamond ombré pavé

from $1,365

Halcyon

Round diamond center and bead set diamonds engagement ring set in platinum

from $2,205

Eclipse

Round diamond solitaire engagement ring with fern detail and star set blue sapphires in platinum

from $3,115

Elixir

Round diamond center and pavé diamond halo engagement ring set in platinum

from $2,380

Damson

Round solitaire engagement ring with blue sapphire pavé

from $1,365

Cinnamon

Round solitaire engagement ring in a prongless setting with diamond halo and pavé band

from $2,065

Selene

Round center with vintage-inspired bezel set diamonds along the band

from $1,820

Celestial

Round center and pavé diamond double halo engagement ring set in platinum

from $2,765

Blossom

Round diamond center and pavé diamonds engagement ring set in platinum

from $1,785

Dove

Round solitaire with pavé diamond halo engagement ring set in platinum

from $1,540

Flourish

Round diamond center and bezel set diamond band engagement ring set in platinum

from $1,995

Lyra

Round diamond solitaire engagement ring with floral ruby halo

from $1,890

Thia

Round center engagement ring with marquise pink sapphires set in platinum

from $1,550

Lyra

Round solitaire engagement ring with floral pink sapphire halo

from $1,890

Damson

Round solitaire engagement ring with pink sapphire pavé

from $1,365

Damson

Round diamond solitaire engagement ring with ruby pavé

from $1,365

Damson

Round solitaire engagement ring with yellow sapphire pavé

from $1,365

Thia

Round center engagement ring with marquise rubys set in platinum

from $1,550

Thia

Round center engagement ring with marquise purple sapphires set in platinum

from $1,780

Platinum Round Diamond Engagement Rings

We want the process of finding a ring to be a creative act, one that gets to the heart of what makes your love unique. Our collection of engagement rings features a diverse range of styles, metals, and ring shapes, making it easy for you to feel confident that you’ve found ‘the one’.

When it comes to engagement rings, platinum has always been the most popular choice—accounting for over 60% of the rings we make today. Durable, naturally bright, and low maintenance, this precious metal makes platinum engagement rings last a lifetime. A platinum band with a unique ring is a match made in heaven, sure to make any centre diamond look its best for years to come.

Who could deny the wow-factor of a brilliant round diamond? Our most popular diamond type by far, round diamond engagement rings are versatile, classic, and can fill and entire room with shimmer light. When set in a engagement ring, round diamonds come alive as they’ve been mathematically developed to reflect the most light. If you want a platinum round diamond engagement ring that stands out from the rest, consider adding some custom details such as an engraving or double prong setting to your design.

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Platinum Round Diamond Engagement Rings

Eve

Cassia

Marula

Faith

Hope

Dulcet

Marula

Faith

Lierre

Faith

Tamora

Serendipity

Thia

Thia

Grace

Faith

Lierre

Splendor

Elysium

Demure

Affinity

Thia

Venus

Lierre

Tamora

Tranquility

Tamora

Allure

Thia

Tranquility

Tranquility

Thimble

Hana

Faith

Marula

Cardamom

Lantana

Purity

Sage

Lissome

Divinity

Joy

Lunarose

Adore

Sonder

Talisman

Bliss

Neptune

Thyme

Aflutter

Aurora

Besso

Lunarose

Faith

Genesis

Eden

Affinity

Lyra

Eclipse

Utopia

Mirror

Nouveau

Aria

Lierre

Symphony

Comet

Fleur

Sirius

Dawn