Lab Grown Diamonds | Lab created Diamonds | man made Diamonds | cultured Diamonds | cultured Diamonds
Color Diamonds Pink | Fancy Color Diamonds Pink
“Floating on pink clouds”
“Looking at something through rose-colored glasses.”
“Passion & Love”
Fancy Color PINK Diamonds
- Symbol for happiness & joy
- Feminine & romantic
- Tenderness & Innocence
- Passionate & caring
- Fine pink
- Pink is a typical pastel shade. It combines the power and love in red with the innocence in white.
- Accordingly, the color stands for powdery tenderness, for tenderness, sensitivity, delicacy and femininity.
- typical girl and baby color
- Accordingly, she is considered particularly innocent and pure
- Pink
- Pink is clearly stronger and more expressive than pink. It rather stands for fascination, joie de vivre, devotion. But also for romance, extraversion and the desire to stand out.
- Popularity
- Pink diamonds = most desirable colored diamonds
- Rarity
- one of the rarest and most expensive colors → highly prized
Australian Argyle mine → produces the most pink diamonds - are also rare & very rare among rennet diamonds (because not easy to grow)
Paler pinks with secondary hues are more common than pure and intense pinks.
- one of the rarest and most expensive colors → highly prized
- Color Cause
- Crystal lattice modification at the atomic level (“plastic deformation”)
- Colored grain
→ results from structural irregularities + combination with impurities → pink occurs when the diamond is subjected to stresses within the earth, and these forces cause slip planes of carbon atom displacement within the diamond crystal
→ selective red light transmitted
…red light appears pink when selective transmission is weak. Selective transmission is rarely strong enough to produce a red color….
- Common Secondary Colors:
- brownish-pink (-> less valuable)
- orangerosa
- purple
- Price range Mine diamonds
- High
- Most valuable / most expensive =
- due to its rarity, pink is generally a valuable color
- pure pink (without secondary colors)
→ Pure pink colors are more popular than diamonds that are purple, orange, brownish or grayish.
→ very high color intensity / strong color + deep pink
→ The more intense the color, the more value - Fancy Intense Pink
- Fancy Deep Pink
- Fancy Vivid Pink
e.g. a Fancy Intense Pink diamond will be worth more than a Fancy Light Pink or Fancy Pink of similar quality.
- Stones with secondary color modifiers that are also rare, e.g. Purple, Orange, Red.
- “Mauve” diamonds → partly marketing of diamonds with violet tones
Classification
- Faint Pink
- Very Light Pink
- Light Pink
- Fancy Light Pink
- Fancy Pink
- Fancy Intense Pink
- Fancy Dark Pink
- Fancy Deep Pink
- Fancy Vivid Pink
Shapes
Round shape is reserved for rough with strong color saturation
→ reflects more white light → color appears weaker
→ Round Pink Diamonds = higher prices, as hard to find
Fancy shapes → maximize color saturation → often ground into pillows, radiants, pears, etc.
Famous Pink Diamonds
High-carat pink diamonds have led several auctions in recent years.
- 2019: “Bubble Gum Pink Diamond” 3.43 Carat Fancy Vivid Purplish Pink, Internally Flawless, Strong Blue Fluorescence -> Christie’s $7.52 million.
- November 16, 2010: “Graff Pink” diamond (fancy intense pink) 24.78 carats -> Sotheby’s for $46 million
- May 2011: “Graff Pink” diamonds in intense pink 10.99 carats -> Sotheby’s $10.84 million
- “Argyle Mystra” round 2.02ct Fancy Vivid Purplish Pink -> ideal combination of carat weight, intensity, cut (round is a very rare shape for a colored diamond) and purple overtone, making this one of the rarest pink diamonds available
Pink Lab diamonds are produced using three different methods
- Temperature post-treatment (600°C to 1000°C) of rare pure TypeIIa diamonds
- Only for CVD Lab diamonds (not for HPHT) during growth 520 nm spectral band
- Addition of large amounts of silicon to the CVD growth process & UV irradiation
1st method (most common)
Temperature post-treatment (600°C to 1000°C) of rare pure TypeIIa diamonds
Irradiation of a diamond grown in the laboratory with nitrogen impurities
→ then expose to moderate temperatures (600°C to 1000°C)
→ produces modification in the crystal lattice (caused by a missing carbon atom adjacent to a nitrogen atom within the lattice), a so-called nitrogen-vacancy center, which is responsible for the color
Only about 0.5% of pink mined diamonds possess this nitrogen-vacancy center, which can be identified by spectroscopic lines at 575 nm and 637 nm
= “nitrogen vacancy pinks”
= “Golconda-Rosa” (but they don’t necessarily have a connection to the Indian mine)
These are type IIa diamonds – a rare type of diamond with an exceptionally pure chemical composition: almost entirely carbon, with negligible amounts of nitrogen or boron – with a very uniform pink color and no visible colored lamellae.
2nd method
Only for CVD Lab diamonds (not for HPHT) during growth 520 nm spectral band
Only occurs in lab diamonds with CVD (chemical vapor deposition), in which a 520 nm spectral band is generated during growth, resulting in an orangy pink color. The GIA has only seen a few of these stones and the color is not as vibrant as other pink lab-grown diamonds.
3rd method (rarest)
Addition of large amounts of silicon to the CVD growth process & UV irradiation
Addition of large amounts of silicon to the CVD growth process which, when exposed to UV irradiation, produces a reversible color change between the stable pink color and a temporary blue color.