DScollection.Paris
I am a collector, glyptician and sculptor. I share my passion for best inhabited natural gemstones. According to Mrs.
GIA short description 2014
Dumortierite, which commonly occurs as a blue borosilicate mineral, is of gemological interest when present in quartzite, making an attractive blue ornamental material. Recently examined by GIA’s Carlsbad laboratory were several examples of dumortierite inclusions in rock crystal quartz provided by Luciana Barbosa (Asheville, North Carolina). Barbosa, the material is re
08/12/2023
SAGENITE silver RUTILE in Crystal rock - 2.1ct Bahia Brazil.
The original definition of the name Sagenite was made by Horace Bénédict de Saussure in 1796:
"These small crystals usually cross at the same angles, so as to form a mesh-like network of parallelograms; it seemed proper to me because of this singular property to provide this stone a name; I have named it Sagenite, from the Greek & Latin word sagena, which means net." Mindat.org
NFS (sorry but i do not sell my collection)
07/12/2023
Crystals are not always straight. There are also CURVED crystals (asbestiform) : here bicolor orange/yellow amphiboles in Brazilian rock crystal.
Ps: Amphibole in quartz are not rare, not too expensive and very attractive if quartz is perfect and colors are bright.
Those colors are natural, just enhanced with warm LEDs light, no photoshop
NFS
06/12/2023
Strange sapphire
R.I.P. RUTILE crystals
This Beryllium treated Sapphire from Madagascar is « sad » because the very high temperature, about 1800 C (for beryllium diffusion of pink/orange color) also
fused rutile Ti02 crystals : titanium from rutile colored sapphire in blue around disappeared rutile crystal.
04/12/2023
Why gold rutile (in quartz) is so attractive ?
- Because it is like gold in water ? Yes…
- Because it shines as yellow diamond under high light ? Yes (in fact refractive index of rutile is far above diamond)
- Because an humble cabochon can get higher luster than a faceted stone) yes…
For all those reasons, Gold Rutile is favorite choice for most
Ps : of course, we are not talking about low density rutile specimen (as Venus hairs) or piece with cracked milky quartz… just perfect pieces, as those on photo from novo Horizonte, Bahia, Brazil.
Not for Sale
03/12/2023
A world within…
Round cabochon 8cts of Acicular radial blue Dumortierite in glassy Brazilian rock crystal.
30/11/2023
Another mineral aquarium…
Pink vermicular and green moss chlorite in glassy Brazilian rock crystal cabochon (not a MasterDome but nice)
29/11/2023
Another mineral aquarium
Bicolor chocolate/pistachio chlorite in clean Brazilian rock crystal.
27/11/2023
Many years ago…
27/11/2023
A mineral aquarium
Multicolor chlorite in Brazilian glassy quartz
22/11/2023
A curiosity !
Vermicular brown chlorite and beige fibrous asbestiform amphibole in Brazilian quartz.
16/11/2023
Bluish radial dumortierite crystals in clear rock crystal.
This one is incredible, very rare, unique.
It is a Curiosity
15/11/2023
Gold fever !
Golden rutile in Brazilian clean rock crystal - Novo Horizonte, Bahia
12mm sphere. - Not for Sale
14/11/2023
blue acicular radial Dumortierite crystals in clean quartz /18ct cabochon
11/11/2023
I am wondering why this silver grey cat’s eye (chatoyancy phenomenon) quartz is so fascinating…?
Not for Sale
11/11/2023
Golden brown Goethite/rock crystal pendant.
Goethite is common in quartz (especially in amethyst) as « plumets » shaped crystals (sprays).
This specimen in rock crystal (Uncolored quartz) is rare.
Refractive index of Goethite is under rutile and with experience easy to distinguish from.
(Commonly confused with cacoxenite as inclusions in quartz, but there is no cacoxenite IN quartz : ON yes, but not IN)
09/11/2023
A Gemstone for Winter, isn’t it ?
Acicular radial icy blue dumortierite crystals in water clean Brazilian quartz
Private collection
Ps: above you can see a small positive crystal of quartz
Not for Sale
03/11/2023
Green chlorite phantom
A crazy one, more than 20 generations of growth!
100% Natural Water clear Brazilian quartz.
NFS.
30/10/2023
5cts of pure dream
Acicular blue dumortierite crystals in optical clean quartz.
Those Crystals are bolder, shorter with more saturated blue than regular ones.
29/10/2023
Cabochon cutting of an humble multi colored layers translucent and opaque calcite :
Funny result, isn’t it ?
Regular cabochon not a MasterDome
26/10/2023
Perpendicular phantom growth of parallel amphibole bluish grey needles in water clear rock crystal - Brazil 2023
24/10/2023
Incredible multi phantom polished quartz point
23/10/2023
28ct radial acicular dumortierite/quartz oval cabochon (GalaxSea grade) set in platinum ring 2017
20/10/2023
Orange hematite crystals/clean quartz necklace
Color of hematite crystals depends of thickness : from yellow (thinner ones) to orange, red and finally black (bluish black if very thick).
So if medium color is orange, color varies from yellow to red, Without ugly black crystals 👍🏻
Hard to photography because of record refractive index of hematite
Not my jewelry, not my collection, but top quality I wanted to share / Not for sale
19/10/2023
Stibnite in water clean quartz - polished cabochon - Brazil.
Not for Sale
15/10/2023
Radial blue dumortierite in clean quartz cabochon…
A World within
NFS
15/10/2023
j’ai plaisir à vous présenter ici une caractéristique esthétique et unique de certaines pierres de ma collection : l’effet fantôme (croissance cristalline alternée en plusieurs étapes)
Cet effet est l’utilisation astucieuse d’inclusions 100% naturelles.
Même si aujourd’hui une partie des professionnel(le)s pensent légitimement voir un Doublet ; Il n’en est rien !
Une simple observation à la lampe UV ôtera les derniers doutes des sceptiques (les colles/résines organiques des doublets apparaissent bleu fluo à la lumière UV)
Ces phantoms (jumelé à la taille Master-Dome) sont essentiellement visible dans de rares Quartz.
14/10/2023
Rare bicolor silver/golden rutile in clean quartz
Rutile crystals are straight but there is optical deformation with cabochon
10/10/2023
A world within… a mineralogical aquarium…
Acicular and radial blue dumortierite crystals in clean quartz - Brazil
Golden rutile crystals with some radial ones, in clean quartz as phantom
Location: Brazil
Golden radial rutile in perfect clean quartz - novo Horizonte, Bahia, BRAZIL
Private collection of Patrick LAU (a friend of mine and a great collector)
06/10/2023
Multicolor chlorite in polished faceted clean quartz - Brazil
What do think about ?
Unanalysed curiosity, very probably rutile needles from anatase crystal, but uncommon epigenic growth…
03/10/2023
A world within… Ugly and Beautiful
Yellow butter sphene crystals in full of flaws clear Quartz
Do you love it ?
Not my collection
03/10/2023
Bold warm brown sagenitic rutile crystals (60 degrees crossed) with green chlorite and some black needles in clean quartz cab from Brazil
30/09/2023
Why the piece on the left worths 50 times more than the one on the right ?
First one is perfect, second one is bigger but with quartz is not clean.
First is thousands times rarer on
Mineralogical description : pyramidal phantom of pyrite crystals in clear Brazilian quartz.
Not for sale
28/09/2023
A world within
Radial gold rutile, brown chlorite in perfect clean Brazilian quartz polished flat cabochon.
27/09/2023
Another humble piece
A multicolored moss chlorite in clear quartz matrix.
Brazil
26/09/2023
A single negative (with flat « polished » facets) quartz crystal in quartz sphere.
Simple and beautiful
Not for sale (but such stones are very affordable, about $50 for perfect ones 16mm)
25/09/2023
Green epidote acicular crystals in a Brazilian quartz polished sphere. 16mm
NFS
Ps: Epidote is commonly confused with green tourmaline.
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