Rings・ Necklaces・ Earrings・ Bracelets・ Diamonds

Diamond Rings

ダイヤモンドリング

Browse over 300 natural diamond rings, each available with GIA, CGL, or GGS certification. From vivid fancy color diamonds — yellow, pink, green, and blue — to elegant colorless stones, our collection spans 18K white gold, yellow gold, pink gold, and platinum settings.

Center stone rings such as solitaires and halos come with GIA or CGL certificates; eternity rings and select styles carry GGS certification. Free ring sizing. Custom orders welcome. Men's diamond rings also available.

Fancy Color Rings

  • 18K Faint Yellow Diamond Ring Round-cut - 1.812ct

    18K Faint Yellow Diamond Ring Round-cut - 1.812ct

    ¥990,000 (Tax incl.)
  • 18K Cushion-cut Light Pink Diamond Ring - 0.71ct

    18K Cushion-cut Light Pink Diamond Ring - 0.71ct

    ¥790,000 (Tax incl.)
  • 18K Pear-cut Fancy Light Brownish Pink Diamond Ring - 0.57ct

    18K Pear-cut Fancy Light Brownish Pink Diamond Ring - 0.57ct

    ¥620,000 (Tax incl.)
  • 18K Oval-cut Vivid Yellow Diamond Ring - 0.59ct

    18K Oval-cut Vivid Yellow Diamond Ring - 0.59ct

    ¥920,000 (Tax incl.)
View all

Colorless Diamond Rings

  • PT900 Cushion-cut Colorless Diamond Ring - 1.91ct

    PT900 Cushion-cut Colorless Diamond Ring - 1.91ct

    ¥570,000 (Tax incl.)
    NEW
  • 18K Diamond Band Ring - 1.5ct

    18K Diamond Band Ring - 1.5ct

    ¥460,000 (Tax incl.)
    NEW
  • 18K Round-cut Diamond Ring - 0.453ct

    18K Round-cut Diamond Ring - 0.453ct

    ¥190,000 (Tax incl.)
    NEW
  • PT900 Flower Design Diamond Ring 1ct

    PT900 Flower Design Diamond Ring 1ct

    ¥250,000 (Tax incl.)
    NEW
View all

How to Choose a Diamond Ring

Fancy Color Diamond or Colorless Diamond — The First Decision

The first and most important decision when choosing a diamond ring is whether you want a fancy color diamond or a colorless one. GIA/CGL graded Colorless diamonds — graded D through J~ — are the traditional choice for engagement rings and anniversary gifts, prized for their bright, white brilliance and timeless versatility. Fancy color diamonds in yellow, pink, green, and blue offer something entirely different: rare, naturally occurring color that makes each stone genuinely unique. Pink diamonds in particular have become increasingly scarce and sought after since the Argyle mine's closure in 2020. Your choice between color and colorless shapes every other decision that follows — budget, metal, shape, and certification. Browse our fancy color diamond rings and colorless diamond rings collections to find your direction.

Choosing a Diamond Shape

Diamond shape has a profound effect on the character and presence of a ring. Round cut is the most popular shape worldwide, offering the highest brilliance of any cut and a timeless appeal that works from everyday wear to formal occasions. Cushion cut combines a softly rounded outline with strong brilliance and an antique quality that many buyers find more distinctive than round. Oval cut creates an elongated silhouette that makes the finger appear longer and more slender — it tends to look larger than its carat weight suggests. Pear shape has a unique directional elegance that works beautifully as a solitaire engagement ring. Emerald cut is a step-cut shape with a cooler, more architectural sparkle that suits a modern, minimal aesthetic. The best shape is ultimately the one that resonates most with the person who will wear it.

Choosing the Right Metal

We carry diamond rings in 18K white gold, 18K yellow gold, 18K pink gold, and platinum. For colorless diamonds, white gold and platinum are the natural choice — both allow the stone's brightness to take center stage without competition. Platinum is harder than white gold, holds its finish longer under daily wear, and is the preferred metal for engagement rings intended to be worn every day. For color diamonds, metal choice depends on the stone's hue: yellow diamonds pair beautifully with both platinum and yellow gold; pink diamonds suit rose gold or platinum; green and blue diamonds tend to look most striking in platinum or white gold settings. If in doubt, platinum is always a safe choice — it ages well, is hypoallergenic, and complements every diamond color.

Carat Weight and Budget

Our diamond ring collection starts from around ¥150,000 for elegant eternity ring styles and extends well beyond ¥5,000,000 for rare fancy color center stones. For engagement rings, 0.5ct to 1ct is the most common range in Japan, though the overall appearance of the ring depends far more on the combination of shape, cut quality, color, and clarity than on carat weight alone. A well-cut 0.7ct round diamond in a clean setting can outshine a poorly graded 1ct stone. For color diamond rings, smaller carat weights in vivid grades often carry significant presence — a 0.5ct Fancy Vivid Yellow in an elegant solitaire setting is a striking piece at a more accessible price point. We recommend discussing your budget and priorities with our specialists before deciding on a specific combination.

Frequently Asked Questions

It depends on what you value most. Colorless diamonds offer timeless, universally appealing brilliance and are the traditional choice for engagement rings. Fancy color diamonds — yellow, pink, green, blue — are rarer, more distinctive, and increasingly sought after as investment pieces. Pink and green diamonds in particular have seen significant increases in value following the Argyle mine's 2020 closure. Both are excellent choices; the right one depends on the wearer's personal style and the occasion.
In Japan, 0.5ct to 1ct is the most commonly chosen range for engagement ring center stones. However, carat weight alone does not determine how impressive a ring looks. The combination of cut quality, color grade, clarity, and shape all contribute to the stone's visual presence. A well-chosen 0.7ct diamond can look larger and more brilliant than a poorly graded 1ct stone. We recommend focusing on overall quality rather than carat weight as the primary criterion.
Rings featuring a prominent center stone — such as solitaires, halos, and three-stone designs — usually come with GIA or CGL certificates. Eternity rings and select multi-stone styles may carry GGS certification. The certificate type is listed on each individual product page. We recommend checking before purchasing.
Yes. We offer free ring sizing before purchase. Some designs, such as eternity rings with stones set all the way around the band, may have limitations on size adjustment — please contact us before ordering if you have a specific size requirement.
Yes. Our appointment-only office is located in Ueno (Okachimachi), Tokyo. You are welcome to try on multiple rings and compare stones side by side with guidance from our specialists. Please book an appointment through our contact page or by phone.
Yes. We can create a completely custom diamond ring based on your preferred diamond — color, carat weight, shape, and grade — combined with your choice of metal and ring design. You can also browse our loose diamond collection to select a specific stone first. Contact us to start the conversation.
Platinum is denser and harder than 18K white gold, making it more durable for daily wear over the long term. It is hypoallergenic and does not need rhodium plating to maintain its white appearance. 18K white gold is lighter and initially slightly brighter in appearance, but may need occasional replating over time. For engagement rings worn every day, platinum is generally the preferred choice. For color diamond rings, yellow gold and rose gold can be excellent options depending on the stone's hue.