【Tokyo, Japan】Omoio Strengthens Diamond Appraisal System in Response to Market Impact from Synthetic Diamond Popularization, Expands Asset Consultation Services

Editor’s Note

This article examines the shifting dynamics in the global diamond market, driven by the rising prominence of lab-grown alternatives. We explore how technological advances, price competitiveness, and ethical considerations are reshaping consumer preferences, particularly among younger buyers, and what this means for the traditional natural diamond industry.

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Background: The Rise of Synthetic Diamonds and Changes in the Natural Diamond Market

In recent years, “synthetic diamonds,” whose market circulation has increased due to technological innovation, have been expanding their market share, particularly among younger generations, due to their price competitiveness and ethical aspects, bringing changes to the natural diamond market environment.
Some reports indicate that the diamond market, long perceived as a “stable asset,” is at a turning point, with major diamond suppliers adjusting prices for natural rough stones.
Amid these market changes, there is growing interest among owners regarding “the impact on the asset value of their jewelry” and “distinguishing between natural and synthetic diamonds.”

Current Challenges: The Need for Expertise to Determine the “Right Time to Sell”

The market for natural diamonds varies in demand depending on the 4C grades (carat, cut, color, clarity), meaning overall market trends do not always directly correlate with the value of individual pieces of jewelry.

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However, as the supply of synthetic diamonds continues to expand, some view that a polarization of value based on grade will progress in the medium to long term.
Therefore, it is becoming increasingly important for owners not to rely solely on online information to make judgments but to understand the accurate value based on individual quality and decide on the appropriate timing for selling or holding onto their assets.

Omoio’s Initiative: Presentation of “Authenticity” and “Fair Price” by GIA-Certified Appraisers

In response to this situation, Omoio has strengthened its appraisal system under the supervision of appraisers holding qualifications from GIA (Gemological Institute of America), the international standard for diamond grading, to protect customers’ valuable assets.
Going beyond merely presenting purchase prices, the company thoroughly provides clear identification of synthetic versus natural diamonds using specialized equipment and evidence-based explanations of asset value based on the latest international market trends. This offers customers the information needed to calmly judge whether they should “sell now or continue holding.”

Comment from an Appraiser at Omoio Ginza Main Store
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“Recently, due to technological advancements and the popularization of synthetic diamonds, changes are occurring in the market for natural diamonds, which have long been regarded as ‘eternal brilliance’ with stable asset value. Particularly for small melee diamonds and certain qualities, a downward trend in market prices is currently observed.
We receive numerous inquiries from customers such as ‘I’m worried if my ring is a synthetic diamond’ and ‘I want to know the value of a gemstone inherited from my grandmother.’ While the overall market is in a phase of price adjustment, high-quality natural diamonds still retain significant value.
The important thing is not to hastily sell based solely on online information but to first know the ‘correct value’ through the eyes of a reliable expert.
At our store, we, who hold GIA qualifications, conduct appraisals that consider the background of each piece of jewelry while empathizing with customers’ concerns. We encourage you to start with just a consultation.”
Future Outlook and Social Significance

According to industry experts, as the trend of increasing supply of synthetic diamonds continues, the price of natural diamonds is likely to remain in an adjustment phase unless the supply-demand balance improves.

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In such an opaque market environment, Omoio will continue to closely monitor trends in the gemstone and precious metals market and fulfill its social role of supporting customers in managing their valuable assets by providing transparent appraisal services.

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⏰ Published on: January 15, 2026