Editor’s Note
**Editor’s Note:** Haruyoshi Group has announced the arrival of two large-carat Tiffany diamond rings at its Ginza Chuo-dori store, with a combined list price of approximately 180 million yen. The 6.12ct and 5.75ct diamonds are noted as extremely rare in the domestic secondary market, with authenticity guaranteed.
2026-07-15 14:45 JST
[Haruyoshi Group Co., Ltd.]
6.12ct / 5.75ct — Extremely rare high-carat diamonds in the domestic secondary market. All items are genuine and authenticity guaranteed. View the actual pieces at Ginza Chuo-dori.
Haruyoshi Group Co., Ltd. (Headquarters: Higashi-Azabu, Minato-ku, Tokyo; President: Toru Yoshiyama), which specializes in the reuse of luxury watches and high-brand jewelry, has added two large-carat diamond rings from Tiffany & Co. to its flagship store, Haruyoshi Ginza Chuo-dori Store (8-8-9 Ginza, Chuo-ku, Tokyo), which recently began in-store sales of high-brand jewelry.
The total list price for the two rings is approximately 181 million yen. Diamonds exceeding 5 carats have extremely limited circulation in the domestic secondary market, making this a rare opportunity to see and handle the actual pieces in-store. Both items are offered with genuine product and authenticity guarantees.
1. Tiffany & Co. Diamond Ring, Cushion Cut, 6.12ct
Brand: Tiffany & Co.
Item: Diamond Ring
Cut: Cushion Cut / Round Brilliant Cut
Carat: 6.12ct
Reference List Price: Approx. 95 million yen
Selling Price: ASK (Please inquire)
The cushion cut is characterized by its rounded square shape and soft brilliance. A size exceeding 6 carats is a masterpiece class offered only to a very limited number of Tiffany customers.
2. Tiffany & Co. Diamond Ring, Emerald Cut, 5.75ct
Brand: Tiffany & Co.
Item: Diamond Ring
Cut: Emerald Cut
Carat: 5.75ct
Reference List Price: Approx. 86 million yen
Selling Price: ASK (Please inquire)
The emerald cut is admired for its serene, transparent brilliance created by step-cut facets. This cut tests the clarity of the stone itself, and combined with the large 5.75-carat size, it is a piece of high interest in terms of asset value.
* Please inquire about the selling price at the store or by phone (03-5797-8283).
* As these are one-of-a-kind items, availability ends once sold.
In recent years, the secondary market for high-brand jewelry has expanded following luxury watches, and large-carat diamonds are increasingly in demand globally as “real assets” that hold their value well. However, there are few places where customers can actually see and consider high-carat masterpieces, which often require long waiting lists or purchase history at official retailers.
Haruyoshi Group achieved cumulative sales of 235.6 billion yen over three fiscal periods in the luxury watch reuse business. Applying the expertise in appraisal and authentication honed through watches to jewelry, the group offers five maisons—Harry Winston, Graff, Tiffany & Co., Bvlgari, and Cartier—all with genuine product and authenticity guarantees at the Haruyoshi Ginza Chuo-dori Store, which opened on June 16, 2026. These two large-carat diamond rings are the flagship items symbolizing this initiative.
Haruyoshi Ginza Chuo-dori Store is also strengthening its purchasing of high-brand jewelry alongside sales. Professional appraisers offer in-store evaluations (free of charge), and large-carat diamonds and rare stones are eligible for high-value purchases. Customers who wish to assess the asset value of jewelry stored at home are welcome to visit.
Purchase site: https://haruyoshi-official.jp/
Toru Yoshiyama, President and Representative Director, Haruyoshi Group Co., Ltd.
Company Overview
– Company Name: Haruyoshi Group Co., Ltd.
– Representative: Toru Yoshiyama, President and Representative Director
– Established: February 2021
– Capital: 50,000,000 yen
– Tokyo Headquarters: VORT Azabu maxim 6F-A, 1-28-12 Higashi-Azabu, Minato-ku, Tokyo 106-0044
– Osaka Branch: Namba Skyo 27F, 5-1-60 Namba, Chuo-ku, Osaka, Osaka 542-0076
– Haruyoshi Ginza Chuo-dori Store: 1F-2F, 8-8-9 Ginza, Chuo-ku, Tokyo 104-0061 (along Ginza Chuo-dori)
– Haruyoshi Store Ginza: 1F-2F, G.O.WEST, 6-4-7 Ginza, Chuo-ku, Tokyo 104-0061
(Business hours: 10:30-19:30 / TEL: 03-5962-8892)
– Business Description: Purchase, wholesale, and retail of luxury watches, Hermès bags, high-brand jewelry, etc. (reuse business)
– Secondhand Dealer License No.: Tokyo Metropolitan Public Safety Commission No. 301092217028
– Corporate Site: https://haruyoshi.co.jp
– Sales Site: https://shop.haruyoshi-official.jp/
– Purchase Site: https://haruyoshi-official.jp/