GIA stands for the Gemological Institute of America. The original developer of the 4Cs system, GIA is an international non-profit organization that provides grading services, diamond identification, and trains gem appraisers.

NIWAKA works exclusively with high-quality diamonds selected under the strictest of standards. Center diamonds used in NIWAKA engagement rings are available in colors graded from D to G, clarity graded from FL (Flawless) to SI1 (Slightly Included) and Triple Excellent cut. For more details, please see the Diamond Guide page.

While the 4Cs are an important indicator of a diamond’s worth, NIWAKA has established its own, even stricter selection guidelines. Our in-house gemologists carefully inspect the diamonds and choose only those of the highest quality. To learn more, please visit the Diamond Guide page.

In adherence with the Kimberley Process, all NIWAKA diamonds are certified as conflict-free.

Yes. NIWAKA diamonds are 100% natural diamonds that have not been subjected to any treatments like clarity or color enhancement.

Yes. All NIWAKA engagement rings come with a GIA Diamond Grading Report or a GIA Diamond Dossier. Please note that hard-copy reports will be provided to customers who placed their orders before February 1, 2023. Digital reports will be issued for orders placed on February 1, 2023 or later. You can access your digital diamond grading report from the About Your Diamonds page.

NIWAKA makes jewelry with platinum, white gold, rose gold and yellow gold. Please refer to each rings design page for available options.

NIWAKA aims to create jewelry that as many people as possible can wear with peace of mind. During the development and crafting stages, we endeavor to minimize the probability that any item will cause an allergic reaction. Please note that we do not disclose the specific metal composition of our jewelry.

*NIWAKA engagement and wedding rings do not include nickel or other metals that are known as especially likely to cause allergic reactions.

*Since metal allergies differ from person to person, we cannot guarantee that no one will develop an allergic reaction. If you experience any discomfort or abnormal skin reaction while wearing your jewelry, please stop using it.

NIWAKA's rings use 95% platinum, maximizing the natural white luster of this noble metal.
Metals that comprise the remaining 5% are an original NIWAKA composition, which ensures that the platinum used in our rings is harder and more durable compared to more common platinum alloys.
*Please note that some of our platinum engagement rings are plated (coated).

NIWAKA's rings use 18K white gold (75% gold), showcasing its beautiful color and shine. Our white gold rings are made without plating (coating), unlike regular white gold jewelry, which eliminates the issue of plating wearing off with time.

NIWAKA's rings use 18K rose gold (75% gold) that glows with a soft pink hue. Our rose gold rings are made without plating (coating), which eliminates the issue of plating wearing off with time.

NIWAKA's rings use 18K yellow gold (75% gold), emphasizing its gorgeous natural color. Our yellow gold rings are made without plating (coating), which eliminates the issue of plating wearing off with time.