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tanzanite

Tanzanite, the December birthstone, is the name given to blue to violet zoisite. It is also known for its strong pleochroism, which means that its color changes depending on the angle from which it is viewed. Its Mohs hardness is 6-7, but it has a cleavage that makes it vulnerable to impacts from certain directions, so if you wear it as jewelry, you should be careful not to expose it to strong impacts.

Carats Gem Magazine
" Tanzanite "


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Tanzanite 1.593ct loose Sale price¥15,800

Sold out Set of 2 Tanzanite stones from Tanzania (2mm, round cut) {Multiple purchase discount available}
Sold out 《Limited to 16 stones》1 tanzanite stone (octagonal cut, 3.0mm)《Multiple purchase discount available》
Sold out Limited to 13 stones Gem gacha💎 Beautiful colored tanzanite 7mm, special cut sphene, heliodor (lots of inclusions) 1 loose stone Multiple purchase discounts available
Sold out Limited to 10 stones: Tanzanite rough stone gacha including bicolor pink tanzanite rough stones (average 4.2 carats) [Multiple purchase discounts available]
Sold out [Available at 10 PM on January 10th] Zoisite Gacha with Certificate of Authenticity (Includes Pink Zoisite, Yellow Zoisite, Green Zoisite, and Tanzanite, 5mm) [Multiple Purchase Discounts Available]
Sold out Tanzanite rough and loose stone set of 2 (average 3.3ct, special cut) from Tanzania {Multiple purchase discounts available}
Sold out Bicolor tanzanite 2.270ct loose
Sold out タンザナイト 0.580ctルース
Sold out [On Sale 2/12 10pm] Tanzanite 0.505ct Loose Stone from Tanzania
Sold out [On Sale at 10 PM on February 5th] Tanzanite from Tanzania, 4.5mm/0.390ct Loose Stone, AIGS
Sold out [On Sale 2/7 at 10pm] Tanzanite from Tanzania 0.417ct Loose Stone
Sold out 18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring
Sold out バイカラータンザナイト 0.581ctルース
Sold out タンザニア産タンザナイト 0.637ctルース
Sold out "Purple Sun Night" Ice Blue Sapphire, Amethyst, Bekiri Blue Garnet, and Tanzanite 13-Stone Half Eternity Ring Set (2.0mm)

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.