Birthstone list

[202608GIA Appraisal Request] [Sale on June 5th at 10 PM] Russian Demantoid Garnet (with horsetail inclusion) 5.8mm/0.876ct Loose Stone with Appraisal Report Sale price¥258,000

【202608GIA Appraisal Request】【On Sale June 5th, 10 PM】Russian Demantoid Garnet (with horsetail inclusion) 6.8mm/1.366ct Loose Stone with Appraisal Report Sale price¥458,000

Russian Demantoid Garnet (Horsetail Recognized) 5.1mm/0.664ct Loose Stone Sale price¥228,000

ロシア産デマントイドガーネット（ホーステール認む） 5.3mm/0.692ctルース

Russian demantoid garnet (horsetail recognized) 5.3mm/0.692ct loose Sale price¥158,000

[202608GIA Appraisal Request] Russian Demantoid Garnet (horsetail inclusion confirmed) 5.2mm/0.661ct Loose Stone Sale price¥248,000

[#202607 Akihabara Popup Out for Sale] [Lottery Sale 12] [For Winners Only] [12562560 Listed] Unheated Montana Sapphire (Yogo Origin) 0.159ct Loose with Certificate Sale price¥98,000

K18YG ブラジル産パライバトルマリン 0.066ct ダイヤモンド0.091ctペンダント（ネックレス）ソーティング

[Lottery Sale 0829] K18YG Brazilian Paraiba Tourmaline 0.066ct Diamond 0.091ct Pendant (Necklace) with Sorting Sale price¥158,000

K18YG タンザニア産アルマンディンガーネット 1.003ct・ピンクサファイアリング

[Available 9/13, 10:00 PM] 18K Yellow Gold Tanzanian Almandine Garnet 1.003ct & Pink Sapphire Ring Sale price¥89,800

Pt900 スリランカ産ブルーサファイア0.465ct ダイヤモンド0.28ctリング鑑別書

[On sale 9/13, 10 PM] Pt900 Sri Lankan Blue Sapphire 0.465ct Diamond 0.28ct Ring with Identification Report Sale price¥118,000

[Available 9/12, 10:00 PM] Colombian Emerald 0.247ct Loose Gemstone Sale price¥39,800

イエローダイヤモンド 0.285ctルース(UNDER N(VERY LIGHT YELLOW), VS-1)

[Available 9/12 at 10:00 PM] Yellow Diamond 0.285ct Loose Stone (VERY LIGHT YELLOW, VS-1) Sale price¥55,800

[Available 9/11 at 10 PM] Almandine Garnet from Tanzania, 1.354ct Loose Gemstone Sale price¥15,800

[Available 9/11 at 10:00 PM] Mexican Fire Opal (faceted cut) 1.255ct loose stone Sale price¥49,800

[Available 9/17 at 10:00 PM] Kenyan Unheated Gold Sheen Sapphire 0.408ct Loose Gemstone with Identification Report Sale price¥25,800

[Available 10/4, 10 PM] Kenyan Unheated Gold Sheen Sapphire 0.224ct Loose Gemstone with Identification Report Sale price¥15,800

Tanzanian Dragon Garnet 0.748ct Loose Stone Sale price¥18,800

[9/7 10 PM Release] Brazilian Bicolor Tourmaline 3.337ct Loose Stone Sale price¥59,800

K18 マダガスカル産パパラチアサファイア 4.3mm/0.412ct・ダイヤモンド0.57ctリング中宝鑑

[Lottery Sale 0812_11] K18 Madagascar Padparadscha Sapphire 0.412ct / Diamond 0.57ct Ring Sale price¥168,000

インターナリーフローレスダイヤモンド（H&C） 4.0mm/0.245ctルース(D, IF, 3Excellent H&C)

【9/6 10:00 PM Sale】Internally Flawless Diamond (H&C) 4.0mm/0.245ct Loose (D, IF, 3Excellent H&C) Sale price¥128,000

[Lottery Sale 3][For Winners Only][Listed as 22602615] K18/Pt950 Brazilian Paraiba Tourmaline 0.053ct Ring (CuO: 1.4%, MnO: 3.1%) Sale price¥158,000

[Available 9/5 at 10 PM] Brazilian Paraiba Tourmaline 4.022ct Loose Gemstone Sale price¥45,800

【9/5 22:00 Release】 Brazilian Paraiba Tourmaline 20.343ct Rough Stone Sale price¥15,800

[Available 9/5, 10 PM] 8.246ct Rough Paraiba Tourmaline from Brazil Sale price¥25,800

Pt900 キャシテライト 4mm/0.57ct ・ダイヤモンド0.16ctペンダントトップ（ネックレストップ）鑑別書

[Lottery Sale 0812_03] Pt900 Cassiterite from Yunnan Province, China 4mm/0.57ct Diamond 0.16ct Pendant Top (Necklace Top) with Appraisal Certificate Sale price¥69,800

[Lottery Sale ②_202608_02] Unheated Kashmir Sapphire 2.6mm/0.110ct Loose Stone GIA Sale price¥79,800

[Listed under 12563270] South African rough diamond (sawable) 0.477ct Sale price¥178,000

[Lottery Sale 0718_05] Unheated Australian Teal Blue Sapphire 1.010 ct Loose GIA Sale price¥128,000

Nigerian Aventurine Aquamarine 0.471ct Loose Stone Sale price¥6,980

Violet Sapphire 4.3mm/0.328ct Loose Sale price¥15,800

Mozambique Pink Tourmaline 1.122ct Loose Stone (Contains CuO) Sale price¥39,800

[Lottery Sale 0707_10] Unheated Montana Sapphire (Yogo Mine) 0.173ct Loose Stone with Japan-Germany Gemological Report Sale price¥98,000

[Lottery Sale 0725_05] Madagascar Teal Blue Sapphire 0.748ct Loose Stone with Appraisal Sale price¥28,800

Lottery Sale 0812_15: Brazilian Indicolite Tourmaline 3.756ct Loose Stone with Japan-Germany Gemological Report Sale price¥98,000

Paraiba Tourmaline from Brazil 0.067 ct loose (CuO: 1.4%, MnO: 2.4%) Sale price¥39,800

Brazilian Paraiba Tourmaline 0.821ct rough stone Sale price¥39,800

Colombian Trapiche Emerald 0.372ct Loose Sale price¥18,800

Russian rough diamond (sawable) 0.098ct loose Sale price¥22,800

Tanzanite from Tanzania 0.262ct loose stone Sale price¥8,800

ブラジル産パライバトルマリン 0.239ctルース（CuO:1.0%、MnO:3.9%）

Brazilian Alexandrite 0.239ct Loose Gemstone [Listed as 12564071] Sale price¥45,800

[Available 9/9 at 10 PM] [Color-Free] Pt900 Diamond 1.00ct V-Shape Ring Sale price¥128,000

【Available 9/9 at 10 PM】【Colori】Pt900 Opal 1.10ct Diamond 0.46ct Ring Sale price¥98,000

K18WG オーロラ天女・アコヤ真珠（アコヤパール）ダイヤモンドブローチ真科研鑑

[Available 9/5 at 10 PM] 18K White Gold Aurora Tennyo Akoya Pearl and Diamond Brooch, with Pearl Science Laboratory Certificate Sale price¥98,000

[Available 9/15, 10 PM] [Colorfry] Pt850 Cross-Shape Pearl Earrings with Appraisal Certificate Sale price¥18,800

[On Sale 9/14, 10:00 PM] [Colorifi] Pt900 Ruby 0.71ct / Diamond 0.24ct Ring with Appraisal Report Sale price¥98,000

[Available Sept 4, 10 PM] Brazilian Color-Shift Amethyst 2.649ct Loose Gemstone Sale price¥9,800

[Available 9/4 at 10 PM] Brazilian Elestial Amethyst 1.855ct Loose Stone Sale price¥8,800

[Available 9/4 at 10 PM] Ruby 0.411ct Loose Stone Sale price¥18,800

【9/4 10:00 PM Sale】Ruby 0.200ct Loose Stone Sale price¥12,800

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.