Vertical: 4.1 - 5.0mm

coming soon

[Listed as 12563740] Madagascar Grandidierite 0.171ct Loose Stone Sale price¥29,800

[Listing No. 12563397] Brazilian Alexandrite 0.217 ct Loose Stone Sale price¥39,800

[Listed 12563403] Petzottaite from Madagascar 0.200ct Loose Sale price¥29,800

[Item 12563407] Afghan Green Hauyne 0.075ct Loose Stone Sale price¥29,800

[On sale July 6th at 10 PM JST] 0.544ct Tanzanian Bi-Color Grossular Garnet Loose Gemstone Sale price¥14,800

【Sales start 10 PM JST on July 6】Tanzanian Bi-Color Grossular Garnet 0.586ct Loose Gemstone Sale price¥14,800

[On sale July 3 at 10 PM] Jeremejevite from Namibia, 0.218ct loose stone, with a certificate of authenticity Sale price¥49,800

[On sale July 12th at 10 PM] Synthetic Rutile 4.3mm/0.447ct Loose Gemstone Sale price¥12,800

[On sale July 5th at 10 PM] Sri Lankan Blue Sapphire, 0.550 ct Loose Stone with Gemstone Report Sale price¥39,800

[On sale July 9th, 10 PM JST] Tanzanian Windsor Sapphire (Purple Sapphire) 0.393ct Loose Stone with Certificate Sale price¥18,800

【Sales start: July 10, 10 PM JST】Madagascar Sapphire 0.553ct Loose Gemstone with Identification Report Sale price¥13,800

[On sale July 5th at 10 PM] Madagascar Padparadscha Sapphire 4.5mm/0.416ct Loose Stone with Chubo Certification Sale price¥98,000

インターナリーフローレスダイヤモンド 0.272ctルース(D, IF, 3Excellent H&C)

[Lottery Sale 0530_03] Internally Flawless Diamond 4.2mm/0.272ct Loose (D, IF, 3Excellent H&C) GIA Sale price¥138,000

フローレスダイヤモンド（H&C） 0.290ctルース(D, FL, 3Excellent H&C)

【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥198,000

フローレスダイヤモンド（H&C） 4.2mm/0.280ctルース(D, FL, 3Excellent H&C) GIA&中宝

【Lottery Sale 0620_09】Flawless Diamond (H&C) 4.2mm/0.280ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL Sale price¥188,000

Brazilian Euclase 0.289ct loose stone Sale price¥12,800

Synthetic Alexandrite 0.287ct loose stone Sale price¥8,800

Sri Lankan Yellow Sapphire 0.349ct Loose Sale price¥12,800

Tanzania Bicolor Zoisite 4.6mm/0.489ct Loose Stone Sale price¥9,800

Tanzania Bicolor Zoisite 4.8mm/0.540ct Loose Stone Sale price¥9,800

Tanzanite from Tanzania 0.497ct loose stone Sale price¥9,800

Tanzania Bicolor Zoisite 4.7mm/0.486ct Loose Stone Sale price¥9,800

Tanzanite from Tanzania 0.245ct loose stone Sale price¥8,800

Tanzania Bicolor Zoisite 0.295ct Loose Stone Sale price¥7,980

Blue sapphire 0.287ct loose Sale price¥12,800

Padparadscha Sapphire 0.560ct Loose Stone Sale price¥75,800

【Sale starts July 6th at 10 PM JST】Madagascar Pezzottaite 0.323ct Loose Stone Sale price¥49,800

[Sale on July 6th at 10 PM] Brazilian Silky Alexandrite Loose Stone 0.265ct with Certificate Sale price¥45,800

[On sale June 23 at 10 PM] Untreated Ruby 0.207ct Loose Stone (Houseki Kyo certificate) Sale price¥69,800

マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.582ctルース

[On sale June 21st at 10 PM] Madagascar Andesine-Labradorite (commonly known as Rainbow Moonstone) 0.582ct Loose Stone Sale price¥6,980

YAG (Yttrium Aluminum Garnet) 4.9mm/0.574ct loose stone Sale price¥8,800

YAG (Yttrium Aluminum Garnet) 5.0mm/0.672ct loose stone Sale price¥9,800

YAG (Yttrium Aluminum Garnet) 4.1mm/0.346ct Loose Stone (Rose Cut) Sale price¥8,800

Tanzanian green sapphire 0.303ct loose stone Sale price¥8,800

Sri Lankan cobalt spinel 0.281ct loose stone Sale price¥55,800

Colombian mint color emerald 0.297ct loose stone Sale price¥8,800

Pakistani Oil in Quartz 0.438ct Loose Stone Sale price¥6,980

マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.807ctルース

[On sale June 26th, 10 PM JST] Madagascar Andesine-Labradorite (Common name: Rainbow Moonstone) 0.807ct Loose Sale price¥8,800

マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.619ctルース

[On sale June 21st at 10 PM] Madagascar Andesine-Labradorite (commonly known as Rainbow Moonstone) 0.619ct Loose Stone Sale price¥6,980

[Sale on June 25th at 10 PM] Jeremejevite from Namibia, 0.095ct loose stone, with鑑別書 Sale price¥24,800

Brazilian Blue Tourmaline 0.196ct Loose Sale price¥6,980

[On sale June 19, 10 PM] Colombian Trapiche Emerald 0.183ct Loose Stone Sale price¥39,800

[Sales on 6/13 at 10 PM] Madagascar Pink Sapphire 0.239ct Loose Stone, Japan-Germany Gemstone Institute certified Sale price¥18,800

[Sale starts June 16th, 10 PM JST] Myanmar Red Spinel 0.234ct Loose Gemstone Sale price¥12,800

[On Sale June 16, 10 PM] Loose 0.249ct Myanmar Red Spinel Sale price¥12,800

[Sale June 15th 10 PM JST] Afghanistan Hauyne 0.098ct Loose Stone with Gemstone Identification Report Sale price¥25,800

[On sale June 23rd, 10 PM JST] Colombian Trapiche Emerald 0.210ct Loose Stone Sale price¥39,800

[On sale June 13th at 10 PM] Blue Sapphire 0.369ct Loose Stone (with Japan-Germany gemological report) Sale price¥22,800

KARATZ Custom Made

Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.

KARATZ・Five Commitments

So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.

KARATZ's Initiatives and Social Contributions

We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.

KARATZ Books

These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.

jeweler's tools

For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.