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Platinum Round Diamond Trilogy Engagement Rings

Drawing together timeless design with modern artistry, our collection of platinum round diamond trilogy 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. A trilogy engagement ring is a timeless symbol of the journey you and your partner have shared as the three gemstones of this ring style represent the past, present, and future. 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.

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Taylor & Hart Marula Round Engagement Ring 360 detail 01

Marula

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

from $1,960
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and teal sapphire sides

from $1,470
Taylor & Hart Marula Round Engagement Ring 360 detail 01

Marula

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

from $1,960
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and pear diamond sides

from $1,470
Taylor & Hart Lierre Round Engagement Ring 360 detail 01

Lierre

Round organic green sapphire and diamond detail engagement ring in platinum

from $1,610
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and blue sapphire sides

from $1,470
Taylor & Hart Tamora Round Engagement Ring 360 detail 01

Tamora

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

from $1,715
Taylor & Hart Thia Round Engagement Ring 360 detail 01

Thia

Round center engagement ring with marquise diamonds set in platinum

from $1,780
Taylor & Hart Thia Round Engagement Ring 360 detail 01

Thia

Round center engagement ring with marquise diamonds set in platinum

from $1,550
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and purple sapphire sides

from $1,470
Taylor & Hart Lierre Round Engagement Ring 360 detail 01

Lierre

Round organic sapphire and diamond detail engagement ring in platinum

from $1,610
Taylor & Hart Affinity Round Engagement Ring 360 detail 01

Affinity

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

from $1,960
Taylor & Hart Thia Round Engagement Ring 360 detail 01

Thia

Round center engagement ring with marquise green sapphires set in platinum

from $1,550
Taylor & Hart Venus Round Engagement Ring 360 detail 01

Venus

Round diamond trilogy with round prongs engagement ring set in platinum

from $2,555
Taylor & Hart Tamora Round Engagement Ring 360 detail 01

Tamora

Round center and marquise diamond petals on a knife edge band

from $1,715
Taylor & Hart Lierre Round Engagement Ring 360 detail 01

Lierre

Round organic diamond detail engagement ring in platinum

from $1,610
Taylor & Hart Tranquility Round Engagement Ring 360 detail 01

Tranquility

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

from $2,030
Taylor & Hart Tamora Round Engagement Ring 360 detail 01

Tamora

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

from $1,715
Taylor & Hart Thia Round Engagement Ring 360 detail 01

Thia

Round center engagement ring with marquise green sapphires set in platinum

from $1,780
Taylor & Hart Tranquility Round Engagement Ring 360 detail 01

Tranquility

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

from $2,030
Taylor & Hart Tranquility Round Engagement Ring 360 detail 01

Tranquility

Round center and side diamond trilogy engagement ring set in platinum

from $2,030
Taylor & Hart Thimble Round Engagement Ring 360 detail 01

Thimble

Round diamond trilogy with filigree basket engagement ring set in platinum

from $1,470
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and peach sapphire sides

from $1,470
Taylor & Hart Marula Round Engagement Ring 360 detail 01

Marula

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

from $1,960
Taylor & Hart Lantana Round Engagement Ring 360 detail 01

Lantana

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

from $1,680
Taylor & Hart Divinity Round Engagement Ring 360 detail 01

Divinity

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

from $1,260
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and green sapphire sides

from $1,470
Taylor & Hart Affinity Round Engagement Ring 360 detail 01

Affinity

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

from $1,960
Taylor & Hart Utopia Round Engagement Ring 360 detail 01

Utopia

Round diamond center and tapered baguettes engagement ring set in platinum

from $2,590
Taylor & Hart Mirror Round Engagement Ring 360 detail 01

Mirror

Round diamond art deco trilogy engagement ring with tapered baguettes

from $1,575
Taylor & Hart Lierre Round Engagement Ring 360 detail 01

Lierre

Round organic ruby detail engagement ring in platinum

from $1,610
Taylor & Hart Tamora Round Engagement Ring 360 detail 01

Tamora

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

from $1,715
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and pink sapphire sides

from $1,470
Taylor & Hart Thia Round Engagement Ring 360 detail 01

Thia

Round center engagement ring with marquise rubys set in platinum

from $1,780
Taylor & Hart Faith Round Engagement Ring 360 detail 01

Faith

Trilogy engagement ring with round center diamond and yellow sapphire sides

from $1,470
Taylor & Hart Thia Round Engagement Ring 360 detail 01

Thia

Round center engagement ring with marquise purple sapphires set in platinum

from $1,550

Platinum Round Diamond Trilogy 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 trilogy engagement rings last a lifetime. A platinum band with a unique trilogy ring is a match made in heaven, sure to make any centre diamond look its best for years to come.

Sometimes referred to as a trinity engagement ring or three stone engagement ring, a trilogy engagement rings feature three gemstones or diamonds, each one representing the past, present, and future. It’s their symbolic nature that makes hearts fall for a platinum trilogy engagement. With three centre stones, a trilogy engagement ring has a bold presence, filled with all the light of your love.

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 trilogy engagement ring, round diamonds come alive as they’ve been mathematically developed to reflect the most light. If you want a platinum round diamond trilogy 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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