0.30 CT Diamond Engagement Ring

A 0.3 carat diamond ring offers a delicate charm, weighing 30% of a full carat and measuring between 4-4.45 mm in diameter. Its size often appears more prominent in round cuts due to their shallower depth. While smaller than many engagement rings, its subtle elegance is a popular choice for those seeking understated beauty. Remember, the carat weight, along with cut, color, and clarity, influences the diamond's price. Explore our collection and discover the perfect blend of sophistication and affordability in our 0.3 carat diamond rings.
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  1. New Mia in White Gold 0.30ct (1.00cttw)
    Round | Natural Diamond | Halo Ring
    40% OFF
    was $1,417.00 Special Price $850.00
  2. Parisian in White Gold 0.30ct
    Round | Natural Diamond | Classic Solitaire Ring
    40% OFF
    was $893.00 Special Price $536.00
  3. 1/3 Carat Diamond Ring | Bellagio
    Round | Natural Diamond | Channel Set Ring
    40% OFF
    was $1,202.00 Special Price $721.00
  4. New Aurora in White Gold 0.30ct (0.95cttw)
    Round | Natural Diamond | Halo Ring
    40% OFF
    was $1,332.00 Special Price $799.00
  5. Diane in White Gold 0.30ct (0.85cttw)
    Round | Natural Diamond | Side-Stones Ring
    40% OFF
    was $1,292.00 Special Price $775.00
  6. Venetian in White Gold 0.30ct
    Round | Natural Diamond | Classic Solitaire Ring
    40% OFF
    was $855.00 Special Price $513.00
  7. Willow in White Gold 0.30ct (0.90cttw)
    Round | Natural Diamond | Ring
    40% OFF
    was $1,910.00 Special Price $1,146.00
  8. Claire in White Gold 0.30ct (0.90cttw)
    Oval | Natural Diamond | Ring
    40% OFF
    was $2,037.00 Special Price $1,222.00
  9. Iris in White Gold 0.30ct (0.90cttw)
    Pear Shape | Natural Diamond | Ring
    40% OFF
    was $2,037.00 Special Price $1,222.00
  10. Catalina in White Gold 0.30ct (0.90cttw)
    Radiant | Natural Diamond | Ring
    40% OFF
    was $2,037.00 Special Price $1,222.00
  11. Jane in White Gold 0.30ct (0.90cttw)
    Emerald | Natural Diamond | Ring
    40% OFF
    was $2,037.00 Special Price $1,222.00
  12. Emma in White Gold 0.30ct (0.70cttw)
    Round | Natural Diamond | Side-Stones Ring
    40% OFF
    was $1,505.00 Special Price $903.00
  13. Ivy in White Gold 0.30ct (1.15cttw)
    Round | Natural Diamond | Halo Ring
    40% OFF
    was $2,010.00 Special Price $1,206.00
  14. Ballerina in White Gold 0.30ct (0.70cttw)
    Round | Natural Diamond | Side-Stones Ring
    40% OFF
    was $1,472.00 Special Price $883.00
  15. Devotion in White Gold 0.30ct
    Princess | Natural Diamond | Classic Solitaire Ring
    40% OFF
    was $1,222.00 Special Price $733.00
  16. Felicienne in White Gold 0.30ct (0.85cttw)
    Princess | Natural Diamond | Side-Stones Ring
    40% OFF
    was $1,762.00 Special Price $1,057.00
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0.3 Carat Diamond Ring

The weight of any size diamond is measured in what is called a carat. This small unit equates to 200 mg. A diamond’s carat weight is often expressed in fractions or points. One carat = 100 points. For instance, about 0.30–0.36 ct. is often referred to as 33 points, 30 carats or ⅓ of a carat. The size of a 0.30 carat diamond ring equals approximately 4–4.45 mm.

In terms of shape, a 0.30 carat round diamond ring will seem bigger than many other cuts. The circular shape is shallower so much of the carat weight is reflected in the diamond size appearance. More elongated cuts such as the marquise, emerald, and oval shapes also tend to appear larger than their actual carat weight.

What is a Diamond’s Carat Total Weight (CTW)?

A diamond’s CTW is the combined weight of all the stones in a single ring or another piece of jewelry. For example, a pair of half carat diamond earrings would have a total weight of 0.50 ct., with each piece weighing 0.25 ct.

The FTC adheres to strict guidelines regarding carat weight and the range that fraction represents. The 0.30 diamond ring you choose may weigh a slight fraction higher or less than the stated carat weight.

Why is Carat Weight so Important?

A diamond’s carat weight is one of the biggest price influencers, in addition, to cut, color and clarity. A 0.30 diamond engagement ring is a smaller size, larger stones are rarer and higher in value. The investment increases with the weight of the diamond.

Is a 0.3 carat diamond too small for an engagement ring?

It's a pretty small diamond but a very popular choice.  A ring with a 0.3 diamond looks very gentle and elegant, it is also less prone to catch threads of your clothing or interfere with your daily work.

Does Carat Weight Affect Diamond Size?

The higher the carat size, the more the depth and diameter increase. A single carat diamond ring with a diameter of about 6.5 mm, will not appear to be twice as wide as a 0.50 ct. stone that with an approximate 5 mm diameter. Also, consider that a 0.30 ct. the diamond engagement ring will look much grander on a small, dainty hand than on one with long fingers.

0.3 Carat Engagement Ring