श्री गुरुभ्यॊ नमः
शांता विमला प्रकाशा अत्मा गुहा चिद् यॊगास्य श्रि परानम्दादि सद्गुरून् नमाम्यहम् पुनः पुनः
OM SRI GURUBHYO NAMAH
SHANTA VIMALA PRAKASHA ATMA GUHA CHID YOGASYA SRI PARANANDADI SADGUROON NAMAMYAHAM PUNAH PUNAH

Soundarya lahari 37 th verse

विशुद्धौ ते शुद्धस्फटिकविशदं व्योमजनकं
शिवं सेवे देवीमपि शिवसमानव्यवसिताम् ।
ययोः कान्त्या यान्त्याः शशिकिरणसारूप्यसरणे-
विधूतान्तर्ध्वान्ता विलसति चकोरीव जगती ॥ ३७॥

viśuddhau te śuddhasphaṭikaviśadaṃ vyomajanakaṃ
śivaṃ seve devīmapi śivasamānavyavasitām ।
yayoḥ kāntyā yāntyāḥ śaśikiraṇasārūpyasaraṇe-
vidhūtāntardhvāntā vilasati cakorīva jagatī ॥ 37॥

“I worship Your viśuddhi cakra, which appears like a clear crystal, the Creator of ākāśa. The qualities of Siva and you are the same. The effulgence radiating from both of You glows like rays of the moon and by these rays , the universe which remained covered by darkness is illumined, like the Chakora bird rejoicing in the light of the moon.”

This verse is related to Vishuddhi chakra having the principle of Akasha. At the time of creation, the Akasha was first created.

tasmādvā etasmādātmana ākāśaḥ sambhūtaḥ । ākāśādvāyuḥ ।
vāyoragniḥ । agnerāpaḥ । adbhyaḥ pṛthivī ।
pṛthivyā oṣadhayaḥ । oṣadhībhyonnam । annātpuruṣaḥ ।

This is first anuvaka in second chapter of Brahmanandavalli in Taittiriya Upanishad.
From Akasha, Vayu, from Vayu agni, from agni Jala, from jala Prithvi from Prithi, Oushadha, from Oushadhi, annam and from Annam all beings.
This may be the reason, while describing the Psychic Chakras, Lalita sahasranama begins it from Vishudhi Chakra, the principle of Akasha.
Kundalini Shakti is directly related to Creation. At Ajnachakra, the mind principle, gets the desire to create. The first creation is Akasha in Vishuddhi, then Vayu in Anahata, Agni in Manipura, Jala in SvadhiShthana and finally earth in Muladhara.
There are different opinions stating that Manipura is jala tatva and Swadhishthana is Agni Tatva. Whatever be the opinion, the creation and Psychic Chakras are related.
“Shuddha Sphatika Vishadam” describes the colour as Pure Crystal. Whether the pure crystal colour refers to the colour of the Vishuddha Chakra or referring to Siva residing here along with Shakti though remains a subject of debate, as I understand, pure crystal is the colour of Siva the creator of Space, the ether, Akasha.
“Vishuddi chakra Nilaya Araktavarna Trilochana khadvangadi praharana vadanaika samanvita paayasanna Priya tvakstha pashulOka bhayanakri amritaadi mahaashakti samvrutaa daakineeshvarI.
This is Lalita sahasranama stotra explaining Vishuddhi chakra. Here also the colour red is referred to SHAKTI residing in Vishuddhi along with Amrutaadi Mahashaktis.
We may conclude referring both Soundarya Lahari and Lalita sahasranama that Siva residing in Vishuddhi is the colour of Pure crystal and Shakti residing along with Siva is of Rakta Varna, the red colour.
Then what is the colour of Visuddhi Chakra?
We know that while colour is the composition of 7 basic colours Violet, Indigo, Blue, Green, Yellow, Orange and Red.
The colours of the Chakras are in the reverse order of VIBGYOR-
Muladhara – Red, SvadhiShthana – Orange, Manipura- Yellow, Anahata- Green, Vishuddha- Blue ( Saphire blue- the colour of the Sky) Ajna- deep Indigo. Sahasrara- whilte or Violet

Here Sri Shankara is telling that whatever be the colour of Vishuddhi Chakra or the Colour of Shakti residing there, they all possess the colour of Pure crystal, the colour of Siva shining in Vishuddhi along with Shakti descending after their union in Sahasrara.
The Vishuddhi Chakra is the starting point of Udana Prana and the function of Udana Prana is to purify the body of toxic substances while breathing.
The Vishuddhi Chakra unleashes an unlimited feeling of happiness and freedom that allows our abilities and skills to blossom. Along with this stage of development there is a clear voice, a talent for singing and speech, as well as balanced and calm thoughts.
“śivasamānavyavasitām “ or “śivasamānavyasanineem” indicates the perfect blending of Shakti with Siva just like milk and water. Only Paramahamsa is adept in experiencing both tatvas.

Akasha has all the ingredients for creation though it is yet evolve into cohesive building blocks of the matter. When Siva & Shakti both grace the plane of Vishudhi, their effulgence lights up the inner consciousness and expels the darkness of the mind.

If one catches the rays of the full moon in a pure crystal the entire area will be filled with effulgence. The true sadhaka wait for the divine nectar like the Chakora bird waits. Meditating thus on Siva and Shakti in Vishuddhi, the sadhaka expels the darkness from the mind.

The descent of Siva and Shakti after their union in Sahasrara is the main feature of Shankara’s worship, because as they descend the divine union of consciousness and energy fulfils his wish to rejuvenate himself. The splendour flows through sushumna like moon beams and floods the entire body.

There is another version about Siva & Shakti. At the time of initial creation, only Śiva was there. Śiva is full of Prakāśa or Self-illumination. Since His Light could not be reflected to the universe, Śiva created Parāśakti to reflect His Light to the universe. As soon as Śakti came into existence, the universe was illuminated, as She alone is capable of reflecting His Light. This is with regard to macrocosm. With regard to microcosm, darkness means spiritual ignorance. When Śiva and Śakti are contemplated together, spiritual ignorance of the contemplator is removed, leading to realization of the Self. Sadhaka becomes identified with Them and this state is known as sārūpya. {Liberation is of four types: Sālokya, co-existence with the Lord in His world. Sārūpya, attaining the same form as that of the Lord. Sāmīpya, proximity as that of the Lord. Sāyujya, absorption into the Lord Himself. The first one Salokya progressively leads to the last one Sayujya.

Some Commentators refer Siva Shakti in Vishuddhi as Ardha nareesvara but Sri Lakshmidhata in his commentary identifies Siva shakti in Vishuddhi chakra as VyomesVara and Vyomeshvari because Vyoma refers to Space, Akasha. He also mentions that Vyomeshvara & Vyomeshari are surrounded by 72 Nabhasa Mayukhas,the celestial rays. He also gives the names of these 72 Nabhasa Mayukhas, whereas Lalita Sahasranama “Vishuddhi Chakra Nilaya” mentions Amritaadi Sixteen mahashaktis residing in 16 lotus petals of Vishuddhi Chakra identified with sixteen vowels.

The worship of the Supreme Shakti descending through the chakras in union with Siva is highly efficacious and removes all the ills and ignorance of the sadhaka.

Blog links to all 7 Soundarya Lahari Verses (36 to 42) to meditate 7 Chakras:

Verse 36 – Meditation upon Ajna Chakra

Verse 37 – Meditation upon Vishuddi Chakra

Verse 38 – Meditation upon Anahata Chakra

Verse 39 – Meditation upon Swadistana Chakra

Verse 40  – Meditation upon Manipura Chakra

Verse 41 – Meditation upon Muladhara Chakra

Verse 42 – Meditation upon Sahasrara Chakra

Loka samasta sukhino bhavantu samasta sanmangalani bhavantu