













[Available 9/27 at 10 PM] Cacholong Amethyst 0.531ct Loose Stone
This amethyst was mined from the Cachoeira mine in the state of Rondônia, Brazil, over a short four-year period between 2000 and 2004. Cachoeira amethyst is known for its vivid deep purple color and is also called "color-shift amethyst" because it takes on a reddish-purple hue under warm lighting. The mine was originally opened to search for the rare metal tantalum ore, and when this amethyst was first brought to Japan, its appearance was so stunning—and its properties so similar to those of synthetic amethyst—that it was initially suspected of being fake. This Cachoeira amethyst was cut by Sri Lankan lapidary Mr. Sanje.
・Type: Loose (Natural Stone)
・Stone Name: Cachoeira Amethyst
・Weight: 0.531ct
・Size: 5.6×5.6mm
・Shape: Round cut
・Scratches/Chips: S
・Inclusions: S
・Notes: ---
・Accessories: KARATZ Quality Guarantee, Loose Stone Case (or a clear zip-lock bag if the stone does not fit)
▷ Jewelry customization available
If you would like to have this stone set in jewelry, please place an order for your preferred setting from the links below:
・[Select by Stone] Simple Order
・[Select by Stone] Semi-Order
*If you would like to see an image of the stone set in a frame, would like to consult about a full custom order, or have any other questions, please feel free to contact us here.
*Rough stones cannot be processed. Please note that some stones may not be eligible for customization.
* While we strive to ensure that the colors in our photos match the actual items, they may appear slightly different depending on the lighting during photography or your monitor settings. Some photos may have been taken using a penlight.
* For products featuring UV fluorescence photos, we use a black light with a wavelength of 365nm. If you use a light with a different wavelength (e.g., around 395nm), the fluorescence may appear weaker or be difficult to observe. The black light used by our shop can be found here.
* For information regarding scratches, chips, treatments, and inclusions, please see here.
* For other frequently asked questions, please see here.
karatz_item_id: 12556687
Choose options





![[10/22, 10:00 PM Sale] <limited to stones> Sky Blue Topaz (Round approx. 8mm, only one stone is approx. 10mm) <multiple purchase discount available></multiple></limited>](http://store.karatz.jp/cdn/shop/files/PA050720_0c803cec-809e-4351-8ed4-19b5405d1e2a.jpg?v=1791592314&width=4000)
![[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》](http://store.karatz.jp/cdn/shop/files/PA174421_dc4a654d-29d9-43bf-a171-6be9a21db408.jpg?v=1792208298&width=3443)
![[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》](http://store.karatz.jp/cdn/shop/files/PA174389.png?v=1792208709&width=4000)
![[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》](http://store.karatz.jp/cdn/shop/files/2026-10-1717.21.50_b5bd12df-a26a-4558-b937-050e8f74386f.png?v=1792225381&width=1256)


![[10/18 10:00 PM Release] Tanzanian Mandarin Garnet 4.5mm/0.529ct Loose Stone with Identification Report](http://store.karatz.jp/cdn/shop/files/PA161584_087bf08f-b8c4-4ad5-839e-853ddac9d8b6.jpg?v=1792157662&width=3280)
![[Ref: 12564456] Mozambique Aquamarine 0.837ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P9304778_1205a47a-754d-4e91-81eb-b5504df57807.jpg?v=1791985647&width=2889)
![[Item 12564407] Stibiotantalite from Afghanistan, 0.200ct loose stone](http://store.karatz.jp/cdn/shop/files/P9087102_156cecc1-8841-415e-947e-90507c14a237.jpg?v=1791932462&width=3296)
![[Item 12564406] Stibiotantalite from Afghanistan, 0.186ct loose stone](http://store.karatz.jp/cdn/shop/files/P9087172_7634593e-09c8-423c-a8d1-5fb037b38167.jpg?v=1791931980&width=3267)
![[Item No. 12564322] Burmese Red Spinel 0.176ct Loose Gemstone](http://store.karatz.jp/cdn/shop/files/P9090184_9700c589-2ea2-4930-80df-edac6c0e1e4b.jpg?v=1791931653&width=2569)
![[Item 12564569] Russian Non-Oiled Emerald 0.121ct Loose Gemstone](http://store.karatz.jp/cdn/shop/files/PA056832_d8692e6e-41d7-484a-8fb3-f15f7831d546.png?v=1791931343&width=2289)
![[Item 12564624] Tanzanian Cobalt Spinel 0.094ct Loose Gemstone](http://store.karatz.jp/cdn/shop/files/PA056278_9e257c06-11b3-4bdf-9629-db55fd3ecd95.jpg?v=1791930983&width=2918)
![[Item 12564627] Bekily Blue Garnet (Color-Change Garnet) from Madagascar, 0.620ct Loose Stone](http://store.karatz.jp/cdn/shop/files/collage_66b45918-a745-4339-8b28-20879c90c42f.png?v=1791930312&width=2000)
![[Item 12564630] Black Sapphire 5.833ct Loose Stone](http://store.karatz.jp/cdn/shop/files/collage_5323eca5-42a7-4c5c-93bd-bc2b890eb781.png?v=1791928900&width=2000)
![[Item 12564325] Kenya Gold Sheen Sapphire (Star Sapphire) 0.477ct Loose Gemstone](http://store.karatz.jp/cdn/shop/files/P9098894_9e71d12f-afda-46cb-99c2-1c15650319a3.jpg?v=1791805575&width=3070)







![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)


![[Jeweler's Tools] Color change penlight loose set](http://store.karatz.jp/cdn/shop/files/P1010673_2976de1d-08ce-4d92-94af-524da4485c99.jpg?v=1725605083&width=4000)